421564655556 has 72 divisors (see below), whose sum is σ = 1162795312224. Its totient is φ = 127714026240.

The previous prime is 421564655549. The next prime is 421564655563. The reversal of 421564655556 is 655556465124.

421564655556 is a `hidden beast` number, since 4 + 21 + 5 + 6 + 4 + 65 + 5 + 556 = 666.

It is an interprime number because it is at equal distance from previous prime (421564655549) and next prime (421564655563).

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, 1428156 + ... + 1697868.

It is an arithmetic number, because the mean of its divisors is an integer number (16149934892).

Almost surely, 2^421564655556 is an apocalyptic number.

It is an amenable number.

421564655556 is an abundant number, since it is smaller than the sum of its proper divisors (741230656668).

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

421564655556 is a wasteful number, since it uses less digits than its factorization.

421564655556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273681 (or 273676 counting only the distinct ones).

The product of its digits is 21600000, while the sum is 54.

The spelling of 421564655556 in words is "four hundred twenty-one billion, five hundred sixty-four million, six hundred fifty-five thousand, five hundred fifty-six".