77132279664 has 120 divisors (see below), whose sum is σ = 235613169792. Its totient is φ = 23360914560.

The previous prime is 77132279641. The next prime is 77132279701. The reversal of 77132279664 is 46697223177.

It is a self number, because there is not a number n which added to its sum of digits gives 77132279664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3198757 + ... + 3222779.

Almost surely, 2^77132279664 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 77132279664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117806584896).

77132279664 is an abundant number, since it is smaller than the sum of its proper divisors (158480890128).

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

77132279664 is a wasteful number, since it uses less digits than its factorization.

77132279664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26075 (or 26066 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 54.

The spelling of 77132279664 in words is "seventy-seven billion, one hundred thirty-two million, two hundred seventy-nine thousand, six hundred sixty-four".