64163744640 has 192 divisors, whose sum is σ = 234599049360. Its totient is φ = 16103817216.

The previous prime is 64163744633. The next prime is 64163744641. The reversal of 64163744640 is 4644736146.

64163744640 is a `hidden beast` number, since 6 + 4 + 1 + 637 + 4 + 4 + 6 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-3 number, since 3×64163744640³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64163744641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229714 + ... + 425553.

Almost surely, 2^64163744640 is an apocalyptic number.

64163744640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64163744640 is an abundant number, since it is smaller than the sum of its proper divisors (170435304720).

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

64163744640 is a wasteful number, since it uses less digits than its factorization.

64163744640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655309 (or 655294 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 45.

The spelling of 64163744640 in words is "sixty-four billion, one hundred sixty-three million, seven hundred forty-four thousand, six hundred forty".