765997678321 has 8 divisors (see below), whose sum is σ = 782637672960. Its totient is φ = 749371940928.

The previous prime is 765997678223. The next prime is 765997678331. The reversal of 765997678321 is 123876799567.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 765997678321 - 2²³ = 765989289713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765997678331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3455656 + ... + 3670633.

It is an arithmetic number, because the mean of its divisors is an integer number (97829709120).

Almost surely, 2^765997678321 is an apocalyptic number.

It is an amenable number.

765997678321 is a deficient number, since it is larger than the sum of its proper divisors (16639994639).

765997678321 is a wasteful number, since it uses less digits than its factorization.

765997678321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7128623.

The product of its digits is 240045120, while the sum is 70.

The spelling of 765997678321 in words is "seven hundred sixty-five billion, nine hundred ninety-seven million, six hundred seventy-eight thousand, three hundred twenty-one".