55566057 has 4 divisors (see below), whose sum is σ = 74088080. Its totient is φ = 37044036.

The previous prime is 55566053. The next prime is 55566061. The reversal of 55566057 is 75066555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (55566053) and next prime (55566061).

It is not a de Polignac number, because 55566057 - 2² = 55566053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55566053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9261007 + ... + 9261012.

It is an arithmetic number, because the mean of its divisors is an integer number (18522020).

Almost surely, 2^55566057 is an apocalyptic number.

It is an amenable number.

55566057 is a deficient number, since it is larger than the sum of its proper divisors (18522023).

55566057 is a wasteful number, since it uses less digits than its factorization.

55566057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18522022.

The product of its (nonzero) digits is 157500, while the sum is 39.

The square root of 55566057 is about 7454.2643500214. The cubic root of 55566057 is about 381.5954549758.

The spelling of 55566057 in words is "fifty-five million, five hundred sixty-six thousand, fifty-seven".