78579146638 has 4 divisors (see below), whose sum is σ = 117868719960. Its totient is φ = 39289573318.

The previous prime is 78579146629. The next prime is 78579146647. The reversal of 78579146638 is 83664197587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83664197587 = 137803 ⋅607129.

It is an interprime number because it is at equal distance from previous prime (78579146629) and next prime (78579146647).

It is a self number, because there is not a number n which added to its sum of digits gives 78579146638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19644786658 + ... + 19644786661.

It is an arithmetic number, because the mean of its divisors is an integer number (29467179990).

Almost surely, 2^78579146638 is an apocalyptic number.

78579146638 is a deficient number, since it is larger than the sum of its proper divisors (39289573322).

78579146638 is a wasteful number, since it uses less digits than its factorization.

78579146638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39289573321.

The product of its digits is 60963840, while the sum is 64.

The spelling of 78579146638 in words is "seventy-eight billion, five hundred seventy-nine million, one hundred forty-six thousand, six hundred thirty-eight".