78699164817 has 16 divisors (see below), whose sum is σ = 129147347840. Its totient is φ = 41511647232.

The previous prime is 78699164807. The next prime is 78699164851. The reversal of 78699164817 is 71846199687.

It is a happy number.

It is not a de Polignac number, because 78699164817 - 2²³ = 78690776209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78699164807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144137392 + ... + 144137937.

It is an arithmetic number, because the mean of its divisors is an integer number (8071709240).

Almost surely, 2^78699164817 is an apocalyptic number.

It is an amenable number.

78699164817 is a deficient number, since it is larger than the sum of its proper divisors (50448183023).

78699164817 is a wasteful number, since it uses less digits than its factorization.

78699164817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288275352.

The product of its digits is 36578304, while the sum is 66.

The spelling of 78699164817 in words is "seventy-eight billion, six hundred ninety-nine million, one hundred sixty-four thousand, eight hundred seventeen".