56510005566 has 32 divisors (see below), whose sum is σ = 129195993600. Its totient is φ = 16141932576.

The previous prime is 56510005529. The next prime is 56510005571. The reversal of 56510005566 is 66550001565.

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, 26260 + ... + 337208.

It is an arithmetic number, because the mean of its divisors is an integer number (4037374800).

Almost surely, 2^56510005566 is an apocalyptic number.

56510005566 is an abundant number, since it is smaller than the sum of its proper divisors (72685988034).

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

56510005566 is a wasteful number, since it uses less digits than its factorization.

56510005566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315288.

The product of its (nonzero) digits is 135000, while the sum is 39.

It can be divided in two parts, 5651000 and 5566, that added together give a triangular number (5656566 = T₃₃₆₃).

The spelling of 56510005566 in words is "fifty-six billion, five hundred ten million, five thousand, five hundred sixty-six".