77117315550 has 48 divisors (see below), whose sum is σ = 208637396352. Its totient is φ = 18695106400.

The previous prime is 77117315479. The next prime is 77117315579. The reversal of 77117315550 is 5551371177.

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, 23367234 + ... + 23370533.

It is an arithmetic number, because the mean of its divisors is an integer number (4346612424).

Almost surely, 2^77117315550 is an apocalyptic number.

77117315550 is an abundant number, since it is smaller than the sum of its proper divisors (131520080802).

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

77117315550 is a wasteful number, since it uses less digits than its factorization.

77117315550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46737793 (or 46737788 counting only the distinct ones).

The product of its (nonzero) digits is 128625, while the sum is 42.

The spelling of 77117315550 in words is "seventy-seven billion, one hundred seventeen million, three hundred fifteen thousand, five hundred fifty".