26403432660 has 72 divisors (see below), whose sum is σ = 87371365536. Its totient is φ = 6400831680.

The previous prime is 26403432637. The next prime is 26403432673. The reversal of 26403432660 is 6623430462.

26403432660 is a `hidden beast` number, since 2 + 640 + 3 + 4 + 3 + 2 + 6 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6665554 + ... + 6669513.

It is an arithmetic number, because the mean of its divisors is an integer number (1213491188).

Almost surely, 2^26403432660 is an apocalyptic number.

26403432660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26403432660 is an abundant number, since it is smaller than the sum of its proper divisors (60967932876).

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

26403432660 is a wasteful number, since it uses less digits than its factorization.

26403432660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13335093 (or 13335088 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

The spelling of 26403432660 in words is "twenty-six billion, four hundred three million, four hundred thirty-two thousand, six hundred sixty".