64173633912 has 128 divisors (see below), whose sum is σ = 184825800000. Its totient is φ = 20606681088.

The previous prime is 64173633911. The next prime is 64173633917. The reversal of 64173633912 is 21933637146.

64173633912 is a `hidden beast` number, since 6 + 4 + 1 + 7 + 3 + 633 + 9 + 1 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64173633911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2801128 + ... + 2823944.

Almost surely, 2^64173633912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64173633912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92412900000).

64173633912 is an abundant number, since it is smaller than the sum of its proper divisors (120652166088).

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

64173633912 is a wasteful number, since it uses less digits than its factorization.

64173633912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23310 (or 23300 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The spelling of 64173633912 in words is "sixty-four billion, one hundred seventy-three million, six hundred thirty-three thousand, nine hundred twelve".