64731165408 has 864 divisors, whose sum is σ = 249399259200. Its totient is φ = 15766603776.

The previous prime is 64731165407. The next prime is 64731165461. The reversal of 64731165408 is 80456113746.

64731165408 is a `hidden beast` number, since 64 + 7 + 31 + 16 + 540 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64731165403) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2232109138 + ... + 2232109166.

It is an arithmetic number, because the mean of its divisors is an integer number (288656550).

Almost surely, 2^64731165408 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 64731165408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124699629600).

64731165408 is an abundant number, since it is smaller than the sum of its proper divisors (184668093792).

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

64731165408 is a wasteful number, since it uses less digits than its factorization.

64731165408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 64731165408 in words is "sixty-four billion, seven hundred thirty-one million, one hundred sixty-five thousand, four hundred eight".