77937808989 has 16 divisors (see below), whose sum is σ = 104666300928. Its totient is φ = 51584684592.

The previous prime is 77937808981. The next prime is 77937809021. The reversal of 77937808989 is 98980873977.

It is not a de Polignac number, because 77937808989 - 2³ = 77937808981 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77937808989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77937808981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320274 + ... + 508380.

It is an arithmetic number, because the mean of its divisors is an integer number (6541643808).

Almost surely, 2^77937808989 is an apocalyptic number.

It is an amenable number.

77937808989 is a deficient number, since it is larger than the sum of its proper divisors (26728491939).

77937808989 is a wasteful number, since it uses less digits than its factorization.

77937808989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189104.

The product of its (nonzero) digits is 384072192, while the sum is 75.

The spelling of 77937808989 in words is "seventy-seven billion, nine hundred thirty-seven million, eight hundred eight thousand, nine hundred eighty-nine".