12401605656 has 64 divisors (see below), whose sum is σ = 37580630400. Its totient is φ = 3758061600.

The previous prime is 12401605649. The next prime is 12401605663. The reversal of 12401605656 is 65650610421.

12401605656 is a `hidden beast` number, since 1 + 2 + 40 + 1 + 605 + 6 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (12401605649) and next prime (12401605663).

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

It is a self number, because there is not a number n which added to its sum of digits gives 12401605656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2607390 + ... + 2612141.

It is an arithmetic number, because the mean of its divisors is an integer number (587197350).

Almost surely, 2^12401605656 is an apocalyptic number.

It is an amenable number.

12401605656 is an abundant number, since it is smaller than the sum of its proper divisors (25179024744).

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

12401605656 is a wasteful number, since it uses less digits than its factorization.

12401605656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219557 (or 5219547 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 12401605656 in words is "twelve billion, four hundred one million, six hundred five thousand, six hundred fifty-six".