77856371160 has 128 divisors (see below), whose sum is σ = 237608510400. Its totient is φ = 20405657600.

The previous prime is 77856371119. The next prime is 77856371167. The reversal of 77856371160 is 6117365877.

It is a happy number.

It is a super-2 number, since 2×77856371160² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77856371167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1636996 + ... + 1683884.

Almost surely, 2^77856371160 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 77856371160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118804255200).

77856371160 is an abundant number, since it is smaller than the sum of its proper divisors (159752139240).

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

77856371160 is a wasteful number, since it uses less digits than its factorization.

77856371160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47141 (or 47137 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 51.

The spelling of 77856371160 in words is "seventy-seven billion, eight hundred fifty-six million, three hundred seventy-one thousand, one hundred sixty".