77655740568 has 128 divisors (see below), whose sum is σ = 229782336000. Its totient is φ = 21856044672.

The previous prime is 77655740543. The next prime is 77655740599. The reversal of 77655740568 is 86504755677.

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, 481146 + ... + 621942.

It is an arithmetic number, because the mean of its divisors is an integer number (1795174500).

Almost surely, 2^77655740568 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 77655740568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114891168000).

77655740568 is an abundant number, since it is smaller than the sum of its proper divisors (152126595432).

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

77655740568 is a wasteful number, since it uses less digits than its factorization.

77655740568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140894 (or 140876 counting only the distinct ones).

The product of its (nonzero) digits is 49392000, while the sum is 60.

The spelling of 77655740568 in words is "seventy-seven billion, six hundred fifty-five million, seven hundred forty thousand, five hundred sixty-eight".