106721668731 has 4 divisors (see below), whose sum is σ = 142295558312. Its totient is φ = 71147779152.

The previous prime is 106721668717. The next prime is 106721668759. The reversal of 106721668731 is 137866127601.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 106721668731 - 2⁶ = 106721668667 is a prime.

It is a super-2 number, since 2×106721668731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106721668331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17786944786 + ... + 17786944791.

It is an arithmetic number, because the mean of its divisors is an integer number (35573889578).

Almost surely, 2^106721668731 is an apocalyptic number.

106721668731 is a deficient number, since it is larger than the sum of its proper divisors (35573889581).

106721668731 is an equidigital number, since it uses as much as digits as its factorization.

106721668731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35573889580.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 106721668731 in words is "one hundred six billion, seven hundred twenty-one million, six hundred sixty-eight thousand, seven hundred thirty-one".