77191917344668 has 144 divisors (see below), whose sum is σ = 163649315020800. Its totient is φ = 31732211064960.

The previous prime is 77191917344611. The next prime is 77191917344671. The reversal of 77191917344668 is 86644371919177.

It is a self number, because there is not a number n which added to its sum of digits gives 77191917344668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 310158703 + ... + 310407481.

Almost surely, 2^{77191917344668} 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 77191917344668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81824657510400).

77191917344668 is an abundant number, since it is smaller than the sum of its proper divisors (86457397676132).

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

77191917344668 is a wasteful number, since it uses less digits than its factorization.

77191917344668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249280 (or 249271 counting only the distinct ones).

The product of its digits is 384072192, while the sum is 73.

The spelling of 77191917344668 in words is "seventy-seven trillion, one hundred ninety-one billion, nine hundred seventeen million, three hundred forty-four thousand, six hundred sixty-eight".