679756733989 has 2 divisors, whose sum is σ = 679756733990. Its totient is φ = 679756733988.

The previous prime is 679756733983. The next prime is 679756734023. The reversal of 679756733989 is 989337657976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426160896100 + 253595837889 = 652810^2 + 503583^2 .

It is a cyclic number.

It is not a de Polignac number, because 679756733989 - 2¹³ = 679756725797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679756733983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339878366994 + 339878366995.

It is an arithmetic number, because the mean of its divisors is an integer number (339878366995).

Almost surely, 2^679756733989 is an apocalyptic number.

It is an amenable number.

679756733989 is a deficient number, since it is larger than the sum of its proper divisors (1).

679756733989 is an equidigital number, since it uses as much as digits as its factorization.

679756733989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240609120, while the sum is 79.

The spelling of 679756733989 in words is "six hundred seventy-nine billion, seven hundred fifty-six million, seven hundred thirty-three thousand, nine hundred eighty-nine".