77718529881 has 12 divisors (see below), whose sum is σ = 115881392640. Its totient is φ = 50140986840.

The previous prime is 77718529873. The next prime is 77718529897. The reversal of 77718529881 is 18892581777.

It is not a de Polignac number, because 77718529881 - 2³ = 77718529873 is a prime.

It is a super-2 number, since 2×77718529881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77718529781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139280241 + ... + 139280798.

It is an arithmetic number, because the mean of its divisors is an integer number (9656782720).

Almost surely, 2^77718529881 is an apocalyptic number.

It is an amenable number.

77718529881 is a deficient number, since it is larger than the sum of its proper divisors (38162862759).

77718529881 is a wasteful number, since it uses less digits than its factorization.

77718529881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278561076 (or 278561073 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 63.

The spelling of 77718529881 in words is "seventy-seven billion, seven hundred eighteen million, five hundred twenty-nine thousand, eight hundred eighty-one".