77788671505648 has 40 divisors (see below), whose sum is σ = 151307064446832. Its totient is φ = 38741697282048.

The previous prime is 77788671505541. The next prime is 77788671505651. The reversal of 77788671505648 is 84650517688777.

It is a super-2 number, since 2×77788671505648² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128761986 + ... + 129364702.

Almost surely, 2^{77788671505648} is an apocalyptic number.

It is an amenable number.

77788671505648 is a deficient number, since it is larger than the sum of its proper divisors (73518392941184).

77788671505648 is a wasteful number, since it uses less digits than its factorization.

77788671505648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634369 (or 634363 counting only the distinct ones).

The product of its (nonzero) digits is 4425523200, while the sum is 79.

The spelling of 77788671505648 in words is "seventy-seven trillion, seven hundred eighty-eight billion, six hundred seventy-one million, five hundred five thousand, six hundred forty-eight".