78365797689 has 4 divisors (see below), whose sum is σ = 104487730256. Its totient is φ = 52243865124.

The previous prime is 78365797669. The next prime is 78365797693. The reversal of 78365797689 is 98679756387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98679756387 = 3 ⋅32893252129.

It is not a de Polignac number, because 78365797689 - 2⁷ = 78365797561 is a prime.

It is a super-2 number, since 2×78365797689² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78365797689.

It is not an unprimeable number, because it can be changed into a prime (78365797649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13060966279 + ... + 13060966284.

It is an arithmetic number, because the mean of its divisors is an integer number (26121932564).

Almost surely, 2^78365797689 is an apocalyptic number.

It is an amenable number.

78365797689 is a deficient number, since it is larger than the sum of its proper divisors (26121932567).

78365797689 is a wasteful number, since it uses less digits than its factorization.

78365797689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26121932566.

The product of its digits is 960180480, while the sum is 75.

The spelling of 78365797689 in words is "seventy-eight billion, three hundred sixty-five million, seven hundred ninety-seven thousand, six hundred eighty-nine".