79865951508 has 384 divisors, whose sum is σ = 255906201600. Its totient is φ = 21032524800.

The previous prime is 79865951507. The next prime is 79865951521. The reversal of 79865951508 is 80515956897.

79865951508 is a `hidden beast` number, since 79 + 8 + 6 + 5 + 9 + 51 + 508 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79865951507) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 189705138 + ... + 189705558.

It is an arithmetic number, because the mean of its divisors is an integer number (666422400).

Almost surely, 2^79865951508 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 79865951508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127953100800).

79865951508 is an abundant number, since it is smaller than the sum of its proper divisors (176040250092).

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

79865951508 is a wasteful number, since it uses less digits than its factorization.

79865951508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 27216000, while the sum is 63.

The spelling of 79865951508 in words is "seventy-nine billion, eight hundred sixty-five million, nine hundred fifty-one thousand, five hundred eight".