65699989984 has 48 divisors (see below), whose sum is σ = 133844069520. Its totient is φ = 31708472320.

The previous prime is 65699989961. The next prime is 65699990003. The reversal of 65699989984 is 48998999656.

It is a junction number, because it is equal to n+sod(n) for n = 65699989898 and 65699989907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4440519 + ... + 4455289.

It is an arithmetic number, because the mean of its divisors is an integer number (2788418115).

Almost surely, 2^65699989984 is an apocalyptic number.

It is an amenable number.

65699989984 is an abundant number, since it is smaller than the sum of its proper divisors (68144079536).

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

65699989984 is a wasteful number, since it uses less digits than its factorization.

65699989984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19603 (or 19595 counting only the distinct ones).

The product of its digits is 2720977920, while the sum is 82.

The spelling of 65699989984 in words is "sixty-five billion, six hundred ninety-nine million, nine hundred eighty-nine thousand, nine hundred eighty-four".