660000657 has 16 divisors (see below), whose sum is σ = 904361472. Its totient is φ = 427889280.

The previous prime is 660000637. The next prime is 660000661. The reversal of 660000657 is 756000066.

It is not a de Polignac number, because 660000657 - 2²² = 655806353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660000637) 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 15 ways as a sum of consecutive naturals, for example, 30528 + ... + 47454.

It is an arithmetic number, because the mean of its divisors is an integer number (56522592).

Almost surely, 2^660000657 is an apocalyptic number.

It is an amenable number.

660000657 is a deficient number, since it is larger than the sum of its proper divisors (244360815).

660000657 is a wasteful number, since it uses less digits than its factorization.

660000657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17288.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 660000657 is about 25690.4779441722. The cubic root of 660000657 is about 870.6590580177.

The spelling of 660000657 in words is "six hundred sixty million, six hundred fifty-seven", and thus it is an aban number.