656478587 has 2 divisors, whose sum is σ = 656478588. Its totient is φ = 656478586.

The previous prime is 656478577. The next prime is 656478611. The reversal of 656478587 is 785874656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656478587 - 2²⁴ = 639701371 is a prime.

It is not a weakly prime, because it can be changed into another prime (656478517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328239293 + 328239294.

It is an arithmetic number, because the mean of its divisors is an integer number (328239294).

Almost surely, 2^656478587 is an apocalyptic number.

656478587 is a deficient number, since it is larger than the sum of its proper divisors (1).

656478587 is an equidigital number, since it uses as much as digits as its factorization.

656478587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11289600, while the sum is 56.

The square root of 656478587 is about 25621.8380878500. The cubic root of 656478587 is about 869.1075478584.

The spelling of 656478587 in words is "six hundred fifty-six million, four hundred seventy-eight thousand, five hundred eighty-seven".