65837936640 has 624 divisors, whose sum is σ = 258169835520. Its totient is φ = 14244249600.

The previous prime is 65837936627. The next prime is 65837936663. The reversal of 65837936640 is 4663973856.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57200065 + ... + 57201215.

Almost surely, 2^65837936640 is an apocalyptic number.

65837936640 is a gapful number since it is divisible by the number (60) 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 65837936640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129084917760).

65837936640 is an abundant number, since it is smaller than the sum of its proper divisors (192331898880).

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

65837936640 is a wasteful number, since it uses less digits than its factorization.

65837936640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 57.

The spelling of 65837936640 in words is "sixty-five billion, eight hundred thirty-seven million, nine hundred thirty-six thousand, six hundred forty".