109906057664881 has 3 divisors (see below), whose sum is σ = 109906068148491. Its totient is φ = 109906047181272.

The previous prime is 109906057664873. The next prime is 109906057664983. The reversal of 109906057664881 is 188466750609901.

It is a happy number.

The square root of 109906057664881 is 10483609.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 63025196423281 + 46880861241600 = 7938841^2 + 6846960^2 .

It is not a de Polignac number, because 109906057664881 - 2³ = 109906057664873 is a prime.

It is a super-2 number, since 2×109906057664881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109906057664881.

It is not an unprimeable number, because it can be changed into a prime (109906057665881) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5241805 + ... + 15725413.

It is an arithmetic number, because the mean of its divisors is an integer number (36635356049497).

Almost surely, 2^{109906057664881} is an apocalyptic number.

109906057664881 is the 10483609-th square number.

109906057664881 is the 5241805-th centered octagonal number.

It is an amenable number.

109906057664881 is a deficient number, since it is larger than the sum of its proper divisors (10483610).

109906057664881 is an frugal number, since it uses more digits than its factorization.

109906057664881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20967218 (or 10483609 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 70.

The spelling of 109906057664881 in words is "one hundred nine trillion, nine hundred six billion, fifty-seven million, six hundred sixty-four thousand, eight hundred eighty-one".