26516651665 has 32 divisors (see below), whose sum is σ = 36497873664. Its totient is φ = 18116904960.

The previous prime is 26516651659. The next prime is 26516651743. The reversal of 26516651665 is 56615661562.

It is not a de Polignac number, because 26516651665 - 2²¹ = 26514554513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14921257 + ... + 14923033.

It is an arithmetic number, because the mean of its divisors is an integer number (1140558552).

Almost surely, 2^26516651665 is an apocalyptic number.

It is an amenable number.

26516651665 is a deficient number, since it is larger than the sum of its proper divisors (9981221999).

26516651665 is a wasteful number, since it uses less digits than its factorization.

26516651665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097.

The product of its digits is 1944000, while the sum is 49.

The spelling of 26516651665 in words is "twenty-six billion, five hundred sixteen million, six hundred fifty-one thousand, six hundred sixty-five".