657745057 has 4 divisors (see below), whose sum is σ = 658013076. Its totient is φ = 657477040.

The previous prime is 657745051. The next prime is 657745061. The reversal of 657745057 is 750547756.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 339443776 + 318301281 = 18424^2 + 17841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657745057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 657744998 and 657745016.

It is not an unprimeable number, because it can be changed into a prime (657745051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130294 + ... + 135247.

It is an arithmetic number, because the mean of its divisors is an integer number (164503269).

Almost surely, 2^657745057 is an apocalyptic number.

It is an amenable number.

657745057 is a deficient number, since it is larger than the sum of its proper divisors (268019).

657745057 is a wasteful number, since it uses less digits than its factorization.

657745057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268018.

The product of its (nonzero) digits is 1029000, while the sum is 46.

The square root of 657745057 is about 25646.5408388734. The cubic root of 657745057 is about 869.6660791888. Note that the first 3 decimals are identical.

The spelling of 657745057 in words is "six hundred fifty-seven million, seven hundred forty-five thousand, fifty-seven".