679457657 has 2 divisors, whose sum is σ = 679457658. Its totient is φ = 679457656.

The previous prime is 679457633. The next prime is 679457693. The reversal of 679457657 is 756754976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677508841 + 1948816 = 26029^2 + 1396^2 .

It is a cyclic number.

It is not a de Polignac number, because 679457657 - 2¹² = 679453561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (679457627) 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, 339728828 + 339728829.

It is an arithmetic number, because the mean of its divisors is an integer number (339728829).

Almost surely, 2^679457657 is an apocalyptic number.

It is an amenable number.

679457657 is a deficient number, since it is larger than the sum of its proper divisors (1).

679457657 is an equidigital number, since it uses as much as digits as its factorization.

679457657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11113200, while the sum is 56.

The square root of 679457657 is about 26066.4085942042. The cubic root of 679457657 is about 879.1320889385.

The spelling of 679457657 in words is "six hundred seventy-nine million, four hundred fifty-seven thousand, six hundred fifty-seven".