679745547991 has 2 divisors, whose sum is σ = 679745547992. Its totient is φ = 679745547990.

The previous prime is 679745547983. The next prime is 679745548021. The reversal of 679745547991 is 199745547976.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 679745547991 - 2³ = 679745547983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679745547931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339872773995 + 339872773996.

It is an arithmetic number, because the mean of its divisors is an integer number (339872773996).

Almost surely, 2^679745547991 is an apocalyptic number.

679745547991 is a deficient number, since it is larger than the sum of its proper divisors (1).

679745547991 is an equidigital number, since it uses as much as digits as its factorization.

679745547991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600112800, while the sum is 73.

The spelling of 679745547991 in words is "six hundred seventy-nine billion, seven hundred forty-five million, five hundred forty-seven thousand, nine hundred ninety-one".