79321866624 has 640 divisors, whose sum is σ = 316989953280. Its totient is φ = 19015741440.

The previous prime is 79321866581. The next prime is 79321866643. The reversal of 79321866624 is 42666812397.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10374547 + ... + 10382189.

It is an arithmetic number, because the mean of its divisors is an integer number (495296802).

Almost surely, 2^79321866624 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 79321866624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158494976640).

79321866624 is an abundant number, since it is smaller than the sum of its proper divisors (237668086656).

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

79321866624 is a wasteful number, since it uses less digits than its factorization.

79321866624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700 (or 7679 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 79321866624 in words is "seventy-nine billion, three hundred twenty-one million, eight hundred sixty-six thousand, six hundred twenty-four".