79171868664 has 256 divisors, whose sum is σ = 270724608000. Its totient is φ = 20931281280.

The previous prime is 79171868663. The next prime is 79171868681. The reversal of 79171868664 is 46686817197.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79171868663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1203259 + ... + 1267349.

It is an arithmetic number, because the mean of its divisors is an integer number (1057518000).

Almost surely, 2^79171868664 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 79171868664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135362304000).

79171868664 is an abundant number, since it is smaller than the sum of its proper divisors (191552739336).

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

79171868664 is a wasteful number, since it uses less digits than its factorization.

79171868664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64175 (or 64165 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 79171868664 in words is "seventy-nine billion, one hundred seventy-one million, eight hundred sixty-eight thousand, six hundred sixty-four".