626648857 has 2 divisors, whose sum is σ = 626648858. Its totient is φ = 626648856.

The previous prime is 626648851. The next prime is 626648927. The reversal of 626648857 is 758846626.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 564727696 + 61921161 = 23764^2 + 7869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-626648857 is a prime.

It is not a weakly prime, because it can be changed into another prime (626648851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313324428 + 313324429.

It is an arithmetic number, because the mean of its divisors is an integer number (313324429).

Almost surely, 2^626648857 is an apocalyptic number.

It is an amenable number.

626648857 is a deficient number, since it is larger than the sum of its proper divisors (1).

626648857 is an equidigital number, since it uses as much as digits as its factorization.

626648857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 52.

The square root of 626648857 is about 25032.9554188074. The cubic root of 626648857 is about 855.7391813359.

The spelling of 626648857 in words is "six hundred twenty-six million, six hundred forty-eight thousand, eight hundred fifty-seven".