77117842542 has 32 divisors (see below), whose sum is σ = 174842075520. Its totient is φ = 22479694560.

The previous prime is 77117842513. The next prime is 77117842573. The reversal of 77117842542 is 24524871177.

It is a junction number, because it is equal to n+sod(n) for n = 77117842491 and 77117842500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26016684 + ... + 26019647.

It is an arithmetic number, because the mean of its divisors is an integer number (5463814860).

Almost surely, 2^77117842542 is an apocalyptic number.

77117842542 is an abundant number, since it is smaller than the sum of its proper divisors (97724232978).

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

77117842542 is a wasteful number, since it uses less digits than its factorization.

77117842542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52036368.

The product of its digits is 878080, while the sum is 48.

The spelling of 77117842542 in words is "seventy-seven billion, one hundred seventeen million, eight hundred forty-two thousand, five hundred forty-two".