56511555 has 8 divisors (see below), whose sum is σ = 90418512. Its totient is φ = 30139488.

The previous prime is 56511551. The next prime is 56511577. The reversal of 56511555 is 55511565.

56511555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 56511555 - 2² = 56511551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56511551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1883704 + ... + 1883733.

It is an arithmetic number, because the mean of its divisors is an integer number (11302314).

Almost surely, 2^56511555 is an apocalyptic number.

56511555 is a deficient number, since it is larger than the sum of its proper divisors (33906957).

56511555 is a wasteful number, since it uses less digits than its factorization.

56511555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3767445.

The product of its digits is 18750, while the sum is 33.

The square root of 56511555 is about 7517.4167770585. The cubic root of 56511555 is about 383.7476708719.

The spelling of 56511555 in words is "fifty-six million, five hundred eleven thousand, five hundred fifty-five".