26400809664 has 84 divisors (see below), whose sum is σ = 75695576320. Its totient is φ = 8797662720.

The previous prime is 26400809639. The next prime is 26400809683. The reversal of 26400809664 is 46690800462.

26400809664 is a `hidden beast` number, since 26 + 400 + 80 + 96 + 64 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3608442 + ... + 3615750.

Almost surely, 2^26400809664 is an apocalyptic number.

26400809664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

26400809664 is an abundant number, since it is smaller than the sum of its proper divisors (49294766656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26400809664 is a wasteful number, since it uses less digits than its factorization.

26400809664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13598 (or 13585 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 26400809664 in words is "twenty-six billion, four hundred million, eight hundred nine thousand, six hundred sixty-four".