79857138816 has 512 divisors, whose sum is σ = 299473305600. Its totient is φ = 20379340800.

The previous prime is 79857138797. The next prime is 79857138827. The reversal of 79857138816 is 61883175897.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9745281 + ... + 9753471.

It is an arithmetic number, because the mean of its divisors is an integer number (584908800).

Almost surely, 2^79857138816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79857138816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149736652800).

79857138816 is an abundant number, since it is smaller than the sum of its proper divisors (219616166784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79857138816 is a wasteful number, since it uses less digits than its factorization.

79857138816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265 (or 8247 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 79857138816 in words is "seventy-nine billion, eight hundred fifty-seven million, one hundred thirty-eight thousand, eight hundred sixteen".