26510809531 has 2 divisors, whose sum is σ = 26510809532. Its totient is φ = 26510809530.

The previous prime is 26510809417. The next prime is 26510809537. The reversal of 26510809531 is 13590801562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26510809531 - 2²⁵ = 26477255099 is a prime.

It is a super-2 number, since 2×26510809531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26510809537) 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 as a sum of consecutive naturals, namely, 13255404765 + 13255404766.

It is an arithmetic number, because the mean of its divisors is an integer number (13255404766).

Almost surely, 2^26510809531 is an apocalyptic number.

26510809531 is a deficient number, since it is larger than the sum of its proper divisors (1).

26510809531 is an equidigital number, since it uses as much as digits as its factorization.

26510809531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 26510809531 in words is "twenty-six billion, five hundred ten million, eight hundred nine thousand, five hundred thirty-one".