718997799817 has 24 divisors (see below), whose sum is σ = 804323671200. Its totient is φ = 642110040000.

The previous prime is 718997799787. The next prime is 718997799899.

718997799817 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-718997799817 is a prime.

It is a super-2 number, since 2×718997799817² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718997749817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2054934 + ... + 2379232.

It is an arithmetic number, because the mean of its divisors is an integer number (33513486300).

Almost surely, 2^718997799817 is an apocalyptic number.

It is an amenable number.

718997799817 is a deficient number, since it is larger than the sum of its proper divisors (85325871383).

718997799817 is a wasteful number, since it uses less digits than its factorization.

718997799817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324645 (or 324634 counting only the distinct ones).

The product of its digits is 1008189504, while the sum is 82.

The spelling of 718997799817 in words is "seven hundred eighteen billion, nine hundred ninety-seven million, seven hundred ninety-nine thousand, eight hundred seventeen".