65456799744 has 384 divisors, whose sum is σ = 206557931520. Its totient is φ = 18381275136.

The previous prime is 65456799671. The next prime is 65456799757. The reversal of 65456799744 is 44799765456.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×65456799744² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 515407809 + ... + 515407935.

It is an arithmetic number, because the mean of its divisors is an integer number (537911280).

Almost surely, 2^65456799744 is an apocalyptic number.

65456799744 is a gapful number since it is divisible by the number (64) 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 65456799744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103278965760).

65456799744 is an abundant number, since it is smaller than the sum of its proper divisors (141101131776).

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

65456799744 is a wasteful number, since it uses less digits than its factorization.

65456799744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 246 counting only the distinct ones).

The product of its digits is 228614400, while the sum is 66.

The spelling of 65456799744 in words is "sixty-five billion, four hundred fifty-six million, seven hundred ninety-nine thousand, seven hundred forty-four".