55500561 has 24 divisors (see below), whose sum is σ = 82442880. Its totient is φ = 35961696.

The previous prime is 55500527. The next prime is 55500607. The reversal of 55500561 is 16500555.

55500561 is a `hidden beast` number, since 55 + 50 + 0 + 561 = 666.

It is not a de Polignac number, because 55500561 - 2⁷ = 55500433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55500161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75351 + ... + 76083.

It is an arithmetic number, because the mean of its divisors is an integer number (3435120).

Almost surely, 2^55500561 is an apocalyptic number.

It is an amenable number.

55500561 is a deficient number, since it is larger than the sum of its proper divisors (26942319).

55500561 is a wasteful number, since it uses less digits than its factorization.

55500561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 55500561 is about 7449.8698646352. The cubic root of 55500561 is about 381.4454665147.

The spelling of 55500561 in words is "fifty-five million, five hundred thousand, five hundred sixty-one".