79655511780 has 672 divisors, whose sum is σ = 291521462400. Its totient is φ = 18098049024.

The previous prime is 79655511773. The next prime is 79655511841. The reversal of 79655511780 is 8711555697.

It is a happy number.

79655511780 is a `hidden beast` number, since 7 + 9 + 6 + 5 + 551 + 1 + 7 + 80 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 190108411 + ... + 190108829.

It is an arithmetic number, because the mean of its divisors is an integer number (433811700).

Almost surely, 2^79655511780 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 79655511780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145760731200).

79655511780 is an abundant number, since it is smaller than the sum of its proper divisors (211865950620).

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

79655511780 is a wasteful number, since it uses less digits than its factorization.

79655511780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 54.

The spelling of 79655511780 in words is "seventy-nine billion, six hundred fifty-five million, five hundred eleven thousand, seven hundred eighty".