16879517523961 has 3 divisors (see below), whose sum is σ = 16879521632431. Its totient is φ = 16879513415492.

The previous prime is 16879517523949. The next prime is 16879517523971. The reversal of 16879517523961 is 16932571597861.

The square root of 16879517523961 is 4108469.

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., 10308395427561 + 6571122096400 = 3210669^2 + 2563420^2 .

It is not a de Polignac number, because 16879517523961 - 2⁵ = 16879517523929 is a prime.

It is a super-2 number, since 2×16879517523961² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16879517523971) 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, 2054235 + ... + 6162703.

Almost surely, 2^{16879517523961} is an apocalyptic number.

16879517523961 is the 4108469-th square number.

16879517523961 is the 2054235-th centered octagonal number.

It is an amenable number.

16879517523961 is a deficient number, since it is larger than the sum of its proper divisors (4108470).

16879517523961 is an frugal number, since it uses more digits than its factorization.

16879517523961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8216938 (or 4108469 counting only the distinct ones).

The product of its digits is 171460800, while the sum is 70.

The spelling of 16879517523961 in words is "sixteen trillion, eight hundred seventy-nine billion, five hundred seventeen million, five hundred twenty-three thousand, nine hundred sixty-one".