77859231156 has 240 divisors, whose sum is σ = 235500367872. Its totient is φ = 21971476800.

The previous prime is 77859231143. The next prime is 77859231167. The reversal of 77859231156 is 65113295877.

77859231156 is a `hidden beast` number, since 7 + 7 + 8 + 592 + 31 + 15 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 80515785 + ... + 80516751.

Almost surely, 2^77859231156 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 77859231156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117750183936).

77859231156 is an abundant number, since it is smaller than the sum of its proper divisors (157641136716).

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

77859231156 is a wasteful number, since it uses less digits than its factorization.

77859231156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392 (or 1381 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The spelling of 77859231156 in words is "seventy-seven billion, eight hundred fifty-nine million, two hundred thirty-one thousand, one hundred fifty-six".