26561623631 has 8 divisors (see below), whose sum is σ = 26661775728. Its totient is φ = 26461512000.

The previous prime is 26561623609. The next prime is 26561623643. The reversal of 26561623631 is 13632616562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26561623631 - 2⁶ = 26561623567 is a prime.

It is a super-2 number, since 2×26561623631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26561623691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2169116 + ... + 2181326.

It is an arithmetic number, because the mean of its divisors is an integer number (3332721966).

Almost surely, 2^26561623631 is an apocalyptic number.

26561623631 is a deficient number, since it is larger than the sum of its proper divisors (100152097).

26561623631 is a wasteful number, since it uses less digits than its factorization.

26561623631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20233.

The product of its digits is 233280, while the sum is 41.

The spelling of 26561623631 in words is "twenty-six billion, five hundred sixty-one million, six hundred twenty-three thousand, six hundred thirty-one".