679877977049 has 2 divisors, whose sum is σ = 679877977050. Its totient is φ = 679877977048.

The previous prime is 679877977021. The next prime is 679877977069. The reversal of 679877977049 is 940779778976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620578421824 + 59299555225 = 787768^2 + 243515^2 .

It is a cyclic number.

It is not a de Polignac number, because 679877977049 - 2²⁰ = 679876928473 is a prime.

It is not a weakly prime, because it can be changed into another prime (679877977069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339938988524 + 339938988525.

It is an arithmetic number, because the mean of its divisors is an integer number (339938988525).

Almost surely, 2^679877977049 is an apocalyptic number.

It is an amenable number.

679877977049 is a deficient number, since it is larger than the sum of its proper divisors (1).

679877977049 is an equidigital number, since it uses as much as digits as its factorization.

679877977049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352442176, while the sum is 80.

The spelling of 679877977049 in words is "six hundred seventy-nine billion, eight hundred seventy-seven million, nine hundred seventy-seven thousand, forty-nine".