789979720657 has 32 divisors (see below), whose sum is σ = 836366636160. Its totient is φ = 745374389760.

The previous prime is 789979720631. The next prime is 789979720711. The reversal of 789979720657 is 756027979987.

It is a cyclic number.

It is not a de Polignac number, because 789979720657 - 2³¹ = 787832237009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (789979720757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38557338 + ... + 38577820.

It is an arithmetic number, because the mean of its divisors is an integer number (26136457380).

Almost surely, 2^789979720657 is an apocalyptic number.

It is an amenable number.

789979720657 is a deficient number, since it is larger than the sum of its proper divisors (46386915503).

789979720657 is a wasteful number, since it uses less digits than its factorization.

789979720657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20833.

The product of its (nonzero) digits is 840157920, while the sum is 76.

The spelling of 789979720657 in words is "seven hundred eighty-nine billion, nine hundred seventy-nine million, seven hundred twenty thousand, six hundred fifty-seven".