78899219117 has 4 divisors (see below), whose sum is σ = 78928303740. Its totient is φ = 78870134496.

The previous prime is 78899219111. The next prime is 78899219137. The reversal of 78899219117 is 71191299887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71191299887 = 647 ⋅110032921.

It can be written as a sum of positive squares in 2 ways, for example, as 52023223396 + 26875995721 = 228086^2 + 163939^2 .

It is a cyclic number.

It is not a de Polignac number, because 78899219117 - 2²⁸ = 78630783661 is a prime.

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 78899219117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78899219111) 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, 14538242 + ... + 14543667.

It is an arithmetic number, because the mean of its divisors is an integer number (19732075935).

Almost surely, 2^78899219117 is an apocalyptic number.

It is an amenable number.

78899219117 is a deficient number, since it is larger than the sum of its proper divisors (29084623).

78899219117 is a wasteful number, since it uses less digits than its factorization.

78899219117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29084622.

The product of its digits is 4572288, while the sum is 62.

The spelling of 78899219117 in words is "seventy-eight billion, eight hundred ninety-nine million, two hundred nineteen thousand, one hundred seventeen".