26105531391 has 40 divisors (see below), whose sum is σ = 39673576800. Its totient is φ = 17102352960.

The previous prime is 26105531359. The next prime is 26105531447. The reversal of 26105531391 is 19313550162.

It is a happy number.

26105531391 is a `hidden beast` number, since 2 + 6 + 1 + 0 + 553 + 13 + 91 = 666.

It is not a de Polignac number, because 26105531391 - 2⁵ = 26105531359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26105531311) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7701325 + ... + 7704713.

It is an arithmetic number, because the mean of its divisors is an integer number (991839420).

Almost surely, 2^26105531391 is an apocalyptic number.

26105531391 is a deficient number, since it is larger than the sum of its proper divisors (13568045409).

26105531391 is a wasteful number, since it uses less digits than its factorization.

26105531391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021 (or 5012 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The spelling of 26105531391 in words is "twenty-six billion, one hundred five million, five hundred thirty-one thousand, three hundred ninety-one".