109578165625681 has 9 divisors (see below), whose sum is σ = 109744218549723. Its totient is φ = 109412363623080.

The previous prime is 109578165625637. The next prime is 109578165625699. The reversal of 109578165625681 is 186526561875901.

The square root of 109578165625681 is 10467959.

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

It can be written as a sum of positive squares in only one way, i.e., 77000782950081 + 32577382675600 = 8775009^2 + 5707660^2 .

It is not a de Polignac number, because 109578165625681 - 2⁷ = 109578165625553 is a prime.

It is a super-2 number, since 2×109578165625681² (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 109578165625681.

It is not an unprimeable number, because it can be changed into a prime (109578165623681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7233352095 + ... + 7233367243.

Almost surely, 2^{109578165625681} is an apocalyptic number.

109578165625681 is the 10467959-th square number.

109578165625681 is the 5233980-th centered octagonal number.

It is an amenable number.

109578165625681 is a deficient number, since it is larger than the sum of its proper divisors (166052924042).

109578165625681 is an frugal number, since it uses more digits than its factorization.

109578165625681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31680 (or 15840 counting only the distinct ones).

The product of its (nonzero) digits is 217728000, while the sum is 70.

The spelling of 109578165625681 in words is "one hundred nine trillion, five hundred seventy-eight billion, one hundred sixty-five million, six hundred twenty-five thousand, six hundred eighty-one".