657073897 has 2 divisors, whose sum is σ = 657073898. Its totient is φ = 657073896.

The previous prime is 657073877. The next prime is 657073931. The reversal of 657073897 is 798370756.

It is a happy number.

657073897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621205776 + 35868121 = 24924^2 + 5989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657073897 is a prime.

It is a super-2 number, since 2×657073897² = 863492212237533218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (657073877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328536948 + 328536949.

It is an arithmetic number, because the mean of its divisors is an integer number (328536949).

Almost surely, 2^657073897 is an apocalyptic number.

It is an amenable number.

657073897 is a deficient number, since it is larger than the sum of its proper divisors (1).

657073897 is an equidigital number, since it uses as much as digits as its factorization.

657073897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The square root of 657073897 is about 25633.4526936970. The cubic root of 657073897 is about 869.3701774450.

The spelling of 657073897 in words is "six hundred fifty-seven million, seventy-three thousand, eight hundred ninety-seven".