57156666 has 16 divisors (see below), whose sum is σ = 130643904. Its totient is φ = 16330464.

The previous prime is 57156647. The next prime is 57156677. The reversal of 57156666 is 66665175.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1360873 = 57156666 / (5 + 7 + 1 + 5 + 6 + 6 + 6 + 6).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680395 + ... + 680478.

It is an arithmetic number, because the mean of its divisors is an integer number (8165244).

Almost surely, 2^57156666 is an apocalyptic number.

57156666 is an abundant number, since it is smaller than the sum of its proper divisors (73487238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57156666 is a wasteful number, since it uses less digits than its factorization.

57156666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360885.

The product of its digits is 226800, while the sum is 42.

The square root of 57156666 is about 7560.2027750584. The cubic root of 57156666 is about 385.2023808067.

The spelling of 57156666 in words is "fifty-seven million, one hundred fifty-six thousand, six hundred sixty-six".