79511091520 has 224 divisors, whose sum is σ = 224872759296. Its totient is φ = 26203392000.

The previous prime is 79511091511. The next prime is 79511091557. The reversal of 79511091520 is 2519011597.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10481649 + ... + 10489231.

Almost surely, 2^79511091520 is an apocalyptic number.

79511091520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79511091520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112436379648).

79511091520 is an abundant number, since it is smaller than the sum of its proper divisors (145361667776).

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

79511091520 is a wasteful number, since it uses less digits than its factorization.

79511091520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7789 (or 7779 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 40.

The spelling of 79511091520 in words is "seventy-nine billion, five hundred eleven million, ninety-one thousand, five hundred twenty".