66957057 has 16 divisors (see below), whose sum is σ = 99521280. Its totient is φ = 44491536.

The previous prime is 66957049. The next prime is 66957061. The reversal of 66957057 is 75075966.

It is a happy number.

It is not a de Polignac number, because 66957057 - 2³ = 66957049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66957017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4648 + ... + 12470.

It is an arithmetic number, because the mean of its divisors is an integer number (6220080).

Almost surely, 2^66957057 is an apocalyptic number.

It is an amenable number.

66957057 is a deficient number, since it is larger than the sum of its proper divisors (32564223).

66957057 is a wasteful number, since it uses less digits than its factorization.

66957057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8149 (or 8143 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 45.

The square root of 66957057 is about 8182.7291901908. The cubic root of 66957057 is about 406.0680178373.

The spelling of 66957057 in words is "sixty-six million, nine hundred fifty-seven thousand, fifty-seven".