65687977992 has 256 divisors, whose sum is σ = 209328537600. Its totient is φ = 16709898240.

The previous prime is 65687977987. The next prime is 65687978017. The reversal of 65687977992 is 29977978656.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22814809 + ... + 22817687.

It is an arithmetic number, because the mean of its divisors is an integer number (817689600).

Almost surely, 2^65687977992 is an apocalyptic number.

65687977992 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65687977992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104664268800).

65687977992 is an abundant number, since it is smaller than the sum of its proper divisors (143640559608).

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

65687977992 is a wasteful number, since it uses less digits than its factorization.

65687977992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276 (or 3272 counting only the distinct ones).

The product of its digits is 720135360, while the sum is 75.

The spelling of 65687977992 in words is "sixty-five billion, six hundred eighty-seven million, nine hundred seventy-seven thousand, nine hundred ninety-two".