65393997240 has 512 divisors, whose sum is σ = 246659696640. Its totient is φ = 13624934400.

The previous prime is 65393997167. The next prime is 65393997269. The reversal of 65393997240 is 4279939356.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 28295685 + ... + 28297995.

It is an arithmetic number, because the mean of its divisors is an integer number (481757220).

Almost surely, 2^65393997240 is an apocalyptic number.

65393997240 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 65393997240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123329848320).

65393997240 is an abundant number, since it is smaller than the sum of its proper divisors (181265699400).

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

65393997240 is a wasteful number, since it uses less digits than its factorization.

65393997240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463 (or 2459 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 57.

The spelling of 65393997240 in words is "sixty-five billion, three hundred ninety-three million, nine hundred ninety-seven thousand, two hundred forty".