556555501566 has 24 divisors (see below), whose sum is σ = 1212118293360. Its totient is φ = 184557263616.

The previous prime is 556555501559. The next prime is 556555501583. The reversal of 556555501566 is 665105555655.

556555501566 is a `hidden beast` number, since 5 + 565 + 5 + 5 + 5 + 0 + 15 + 66 = 666.

It is a congruent number.

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, 80099506 + ... + 80106453.

It is an arithmetic number, because the mean of its divisors is an integer number (50504928890).

Almost surely, 2^556555501566 is an apocalyptic number.

556555501566 is an abundant number, since it is smaller than the sum of its proper divisors (655562791794).

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

556555501566 is a wasteful number, since it uses less digits than its factorization.

556555501566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160206160 (or 160206157 counting only the distinct ones).

The product of its (nonzero) digits is 16875000, while the sum is 54.

The spelling of 556555501566 in words is "five hundred fifty-six billion, five hundred fifty-five million, five hundred one thousand, five hundred sixty-six".