79978711787997 has 48 divisors (see below), whose sum is σ = 121054453571520. Its totient is φ = 46898418251520.

The previous prime is 79978711787987. The next prime is 79978711788037.

It is a happy number.

79978711787997 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 79978711787997 - 2⁴ = 79978711787981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79978711787917) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14229328 + ... + 19037625.

It is an arithmetic number, because the mean of its divisors is an integer number (2521967782740).

Almost surely, 2^{79978711787997} is an apocalyptic number.

It is an amenable number.

79978711787997 is a deficient number, since it is larger than the sum of its proper divisors (41075741783523).

79978711787997 is a wasteful number, since it uses less digits than its factorization.

79978711787997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33267194 (or 33267183 counting only the distinct ones).

The product of its digits is 49401285696, while the sum is 96.

It can be divided in two parts, 79978711 and 787997, that added together give a palindrome (80766708).

The spelling of 79978711787997 in words is "seventy-nine trillion, nine hundred seventy-eight billion, seven hundred eleven million, seven hundred eighty-seven thousand, nine hundred ninety-seven".