799877778997 has 18 divisors (see below), whose sum is σ = 919092869366. Its totient is φ = 695545839120.

The previous prime is 799877778989. The next prime is 799877779007.

799877778997 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 596615663281 + 203262115716 = 772409^2 + 450846^2 .

It is not a de Polignac number, because 799877778997 - 2³ = 799877778989 is a prime.

It is a super-2 number, since 2×799877778997² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799877278997) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6184158 + ... + 6312175.

Almost surely, 2^799877778997 is an apocalyptic number.

It is an amenable number.

799877778997 is a deficient number, since it is larger than the sum of its proper divisors (119215090369).

799877778997 is a wasteful number, since it uses less digits than its factorization.

799877778997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12496401 (or 12496367 counting only the distinct ones).

The product of its digits is 49401285696, while the sum is 94.

The spelling of 799877778997 in words is "seven hundred ninety-nine billion, eight hundred seventy-seven million, seven hundred seventy-eight thousand, nine hundred ninety-seven".