66570057 has 6 divisors (see below), whose sum is σ = 96156762. Its totient is φ = 44380032.

The previous prime is 66570047. The next prime is 66570059. The reversal of 66570057 is 75007566.

It can be written as a sum of positive squares in only one way, i.e., 41679936 + 24890121 = 6456^2 + 4989^2 .

It is not a de Polignac number, because 66570057 - 2⁷ = 66569929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66570059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3698328 + ... + 3698345.

It is an arithmetic number, because the mean of its divisors is an integer number (16026127).

Almost surely, 2^66570057 is an apocalyptic number.

It is an amenable number.

66570057 is a deficient number, since it is larger than the sum of its proper divisors (29586705).

66570057 is a wasteful number, since it uses less digits than its factorization.

66570057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7396679 (or 7396676 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 66570057 is about 8159.0475547088. The cubic root of 66570057 is about 405.2841718465.

The spelling of 66570057 in words is "sixty-six million, five hundred seventy thousand, fifty-seven".