56501555 has 24 divisors (see below), whose sum is σ = 75797232. Its totient is φ = 40392000.

The previous prime is 56501537. The next prime is 56501581. The reversal of 56501555 is 55510565.

It is not a de Polignac number, because 56501555 - 2⁶ = 56501491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36140 + ... + 37670.

It is an arithmetic number, because the mean of its divisors is an integer number (3158218).

Almost surely, 2^56501555 is an apocalyptic number.

56501555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

56501555 is a deficient number, since it is larger than the sum of its proper divisors (19295677).

56501555 is a wasteful number, since it uses less digits than its factorization.

56501555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 56501555 is about 7516.7516255361. The cubic root of 56501555 is about 383.7250341852.

The spelling of 56501555 in words is "fifty-six million, five hundred one thousand, five hundred fifty-five".