77959167138 has 96 divisors (see below), whose sum is σ = 178376470272. Its totient is φ = 24558336000.

The previous prime is 77959167127. The next prime is 77959167157. The reversal of 77959167138 is 83176195977.

77959167138 is a `hidden beast` number, since 7 + 7 + 9 + 591 + 6 + 7 + 1 + 38 = 666.

It is a super-2 number, since 2×77959167138² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30558963 + ... + 30561513.

It is an arithmetic number, because the mean of its divisors is an integer number (1858088232).

Almost surely, 2^77959167138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77959167138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89188235136).

77959167138 is an abundant number, since it is smaller than the sum of its proper divisors (100417303134).

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

77959167138 is a wasteful number, since it uses less digits than its factorization.

77959167138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440 (or 3437 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 63.

The spelling of 77959167138 in words is "seventy-seven billion, nine hundred fifty-nine million, one hundred sixty-seven thousand, one hundred thirty-eight".