26540262631 has 4 divisors (see below), whose sum is σ = 26566883752. Its totient is φ = 26513641512.

The previous prime is 26540262569. The next prime is 26540262667. The reversal of 26540262631 is 13626204562.

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

It is a cyclic number.

It is not a de Polignac number, because 26540262631 - 2²³ = 26531874023 is a prime.

It is a super-2 number, since 2×26540262631² (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 (26540202631) 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 3 ways as a sum of consecutive naturals, for example, 13309065 + ... + 13311058.

It is an arithmetic number, because the mean of its divisors is an integer number (6641720938).

Almost surely, 2^26540262631 is an apocalyptic number.

26540262631 is a deficient number, since it is larger than the sum of its proper divisors (26621121).

26540262631 is an equidigital number, since it uses as much as digits as its factorization.

26540262631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26621120.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 26540262631 in words is "twenty-six billion, five hundred forty million, two hundred sixty-two thousand, six hundred thirty-one".