78579948921 has 8 divisors (see below), whose sum is σ = 104800903200. Its totient is φ = 52372813632.

The previous prime is 78579948913. The next prime is 78579948943. The reversal of 78579948921 is 12984997587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78579948921 - 2³ = 78579948913 is a prime.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78579948901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3441471 + ... + 3464228.

It is an arithmetic number, because the mean of its divisors is an integer number (13100112900).

Almost surely, 2^78579948921 is an apocalyptic number.

It is an amenable number.

78579948921 is a deficient number, since it is larger than the sum of its proper divisors (26220954279).

78579948921 is a wasteful number, since it uses less digits than its factorization.

78579948921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909495.

The product of its digits is 91445760, while the sum is 69.

The spelling of 78579948921 in words is "seventy-eight billion, five hundred seventy-nine million, nine hundred forty-eight thousand, nine hundred twenty-one".