657245887 has 2 divisors, whose sum is σ = 657245888. Its totient is φ = 657245886.

The previous prime is 657245881. The next prime is 657245909. The reversal of 657245887 is 788542756.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 657245887 - 2¹⁵ = 657213119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (657245881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328622943 + 328622944.

It is an arithmetic number, because the mean of its divisors is an integer number (328622944).

Almost surely, 2^657245887 is an apocalyptic number.

657245887 is a deficient number, since it is larger than the sum of its proper divisors (1).

657245887 is an equidigital number, since it uses as much as digits as its factorization.

657245887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3763200, while the sum is 52.

The square root of 657245887 is about 25636.8072700171. The cubic root of 657245887 is about 869.4460237759.

The spelling of 657245887 in words is "six hundred fifty-seven million, two hundred forty-five thousand, eight hundred eighty-seven".