655974857 has 2 divisors, whose sum is σ = 655974858. Its totient is φ = 655974856.

The previous prime is 655974853. The next prime is 655974871. The reversal of 655974857 is 758479556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560931856 + 95043001 = 23684^2 + 9749^2 .

It is a cyclic number.

It is not a de Polignac number, because 655974857 - 2² = 655974853 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655974853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327987428 + 327987429.

It is an arithmetic number, because the mean of its divisors is an integer number (327987429).

Almost surely, 2^655974857 is an apocalyptic number.

It is an amenable number.

655974857 is a deficient number, since it is larger than the sum of its proper divisors (1).

655974857 is an equidigital number, since it uses as much as digits as its factorization.

655974857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584000, while the sum is 56.

The square root of 655974857 is about 25612.0061104163. The cubic root of 655974857 is about 868.8851960670.

The spelling of 655974857 in words is "six hundred fifty-five million, nine hundred seventy-four thousand, eight hundred fifty-seven".