56556665 has 8 divisors (see below), whose sum is σ = 74037888. Its totient is φ = 41132080.

The previous prime is 56556659. The next prime is 56556691. The reversal of 56556665 is 56665565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56556665 - 2⁴ = 56556649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514097 + ... + 514206.

It is an arithmetic number, because the mean of its divisors is an integer number (9254736).

Almost surely, 2^56556665 is an apocalyptic number.

56556665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56556665 is a deficient number, since it is larger than the sum of its proper divisors (17481223).

56556665 is a wasteful number, since it uses less digits than its factorization.

56556665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028319.

The product of its digits is 810000, while the sum is 44.

The square root of 56556665 is about 7520.4165443146. The cubic root of 56556665 is about 383.8497517848.

Subtracting 56556665 from its reverse (56665565), we obtain a square (108900 = 330²).

The spelling of 56556665 in words is "fifty-six million, five hundred fifty-six thousand, six hundred sixty-five".