26643642022665 has 256 divisors, whose sum is σ = 50000456908800. Its totient is φ = 13447099008000.

The previous prime is 26643642022559. The next prime is 26643642022687. The reversal of 26643642022665 is 56622024634662.

It is a happy number.

26643642022665 is a `hidden beast` number, since 266 + 43 + 64 + 2 + 0 + 226 + 65 = 666.

It is not a de Polignac number, because 26643642022665 - 2⁸ = 26643642022409 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 10996136644 + ... + 10996139066.

It is an arithmetic number, because the mean of its divisors is an integer number (195314284800).

Almost surely, 2^{26643642022665} is an apocalyptic number.

It is an amenable number.

26643642022665 is a deficient number, since it is larger than the sum of its proper divisors (23356814886135).

26643642022665 is a wasteful number, since it uses less digits than its factorization.

26643642022665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925 (or 2919 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 54.

The spelling of 26643642022665 in words is "twenty-six trillion, six hundred forty-three billion, six hundred forty-two million, twenty-two thousand, six hundred sixty-five".