65596940640 has 1536 divisors, whose sum is σ = 307257753600. Its totient is φ = 12660572160.

The previous prime is 65596940623. The next prime is 65596940681. The reversal of 65596940640 is 4604969556.

65596940640 is a `hidden beast` number, since 6 + 5 + 596 + 9 + 4 + 0 + 6 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 613055467 + ... + 613055573.

It is an arithmetic number, because the mean of its divisors is an integer number (200037600).

Almost surely, 2^65596940640 is an apocalyptic number.

65596940640 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 65596940640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153628876800).

65596940640 is an abundant number, since it is smaller than the sum of its proper divisors (241660812960).

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

65596940640 is a wasteful number, since it uses less digits than its factorization.

65596940640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 65596940640 in words is "sixty-five billion, five hundred ninety-six million, nine hundred forty thousand, six hundred forty".