64797511680 has 1040 divisors, whose sum is σ = 262033890624. Its totient is φ = 15182069760.

The previous prime is 64797511679. The next prime is 64797511699. The reversal of 64797511680 is 8611579746.

64797511680 is a `hidden beast` number, since 6 + 47 + 9 + 7 + 511 + 6 + 80 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 967127007 + ... + 967127073.

Almost surely, 2^64797511680 is an apocalyptic number.

64797511680 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 64797511680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131016945312).

64797511680 is an abundant number, since it is smaller than the sum of its proper divisors (197236378944).

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

64797511680 is a wasteful number, since it uses less digits than its factorization.

64797511680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 64797511680 in words is "sixty-four billion, seven hundred ninety-seven million, five hundred eleven thousand, six hundred eighty".