657422057 has 2 divisors, whose sum is σ = 657422058. Its totient is φ = 657422056.

The previous prime is 657422047. The next prime is 657422081. The reversal of 657422057 is 750224756.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483076441 + 174345616 = 21979^2 + 13204^2 .

It is a cyclic number.

It is not a de Polignac number, because 657422057 - 2⁶ = 657421993 is a prime.

It is a super-2 number, since 2×657422057² = 864407522060222498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 657422057.

It is not a weakly prime, because it can be changed into another prime (657422027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328711028 + 328711029.

It is an arithmetic number, because the mean of its divisors is an integer number (328711029).

Almost surely, 2^657422057 is an apocalyptic number.

It is an amenable number.

657422057 is a deficient number, since it is larger than the sum of its proper divisors (1).

657422057 is an equidigital number, since it uses as much as digits as its factorization.

657422057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 657422057 is about 25640.2429200661. The cubic root of 657422057 is about 869.5236997395.

The spelling of 657422057 in words is "six hundred fifty-seven million, four hundred twenty-two thousand, fifty-seven".