77185981668 has 24 divisors (see below), whose sum is σ = 180381610080. Its totient is φ = 25688519680.

The previous prime is 77185981667. The next prime is 77185981673. The reversal of 77185981668 is 86618958177.

It is a junction number, because it is equal to n+sod(n) for n = 77185981599 and 77185981608.

It is not an unprimeable number, because it can be changed into a prime (77185981667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5009598 + ... + 5024981.

It is an arithmetic number, because the mean of its divisors is an integer number (7515900420).

Almost surely, 2^77185981668 is an apocalyptic number.

It is an amenable number.

77185981668 is an abundant number, since it is smaller than the sum of its proper divisors (103195628412).

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

77185981668 is a wasteful number, since it uses less digits than its factorization.

77185981668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10035227 (or 10035225 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 66.

The spelling of 77185981668 in words is "seventy-seven billion, one hundred eighty-five million, nine hundred eighty-one thousand, six hundred sixty-eight".