77713681108 has 18 divisors (see below), whose sum is σ = 158202851226. Its totient is φ = 33305863248.

The previous prime is 77713681093. The next prime is 77713681141. The reversal of 77713681108 is 80118631777.

It can be written as a sum of positive squares in only one way, i.e., 65767628304 + 11946052804 = 256452^2 + 109298^2 .

It is a super-2 number, since 2×77713681108² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198248991 + ... + 198249382.

Almost surely, 2^77713681108 is an apocalyptic number.

It is an amenable number.

77713681108 is an abundant number, since it is smaller than the sum of its proper divisors (80489170118).

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

77713681108 is a wasteful number, since it uses less digits than its factorization.

77713681108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396498391 (or 396498382 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 49.

The spelling of 77713681108 in words is "seventy-seven billion, seven hundred thirteen million, six hundred eighty-one thousand, one hundred eight".