56751566 has 4 divisors (see below), whose sum is σ = 85127352. Its totient is φ = 28375782.

The previous prime is 56751551. The next prime is 56751619. The reversal of 56751566 is 66515765.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66515765 = 5 ⋅13303153.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14187890 + ... + 14187893.

It is an arithmetic number, because the mean of its divisors is an integer number (21281838).

Almost surely, 2^56751566 is an apocalyptic number.

56751566 is a deficient number, since it is larger than the sum of its proper divisors (28375786).

56751566 is a wasteful number, since it uses less digits than its factorization.

56751566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28375785.

The product of its digits is 189000, while the sum is 41.

The square root of 56751566 is about 7533.3635250132. The cubic root of 56751566 is about 384.2901768983.

The spelling of 56751566 in words is "fifty-six million, seven hundred fifty-one thousand, five hundred sixty-six".