79865550720 has 256 divisors, whose sum is σ = 286736443200. Its totient is φ = 21005402112.

The previous prime is 79865550691. The next prime is 79865550749. The reversal of 79865550720 is 2705556897.

79865550720 is a `hidden beast` number, since 7 + 9 + 8 + 65 + 550 + 7 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (79865550691) and next prime (79865550749).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

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, 1229784 + ... + 1293096.

Almost surely, 2^79865550720 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 79865550720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143368221600).

79865550720 is an abundant number, since it is smaller than the sum of its proper divisors (206870892480).

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

79865550720 is a wasteful number, since it uses less digits than its factorization.

79865550720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63414 (or 63396 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 54.

The spelling of 79865550720 in words is "seventy-nine billion, eight hundred sixty-five million, five hundred fifty thousand, seven hundred twenty".