64497689736 has 64 divisors (see below), whose sum is σ = 164081998080. Its totient is φ = 21121697280.

The previous prime is 64497689723. The next prime is 64497689759. The reversal of 64497689736 is 63798679446.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1228945 + ... + 1280351.

It is an arithmetic number, because the mean of its divisors is an integer number (2563781220).

Almost surely, 2^64497689736 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 64497689736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82040999040).

64497689736 is an abundant number, since it is smaller than the sum of its proper divisors (99584308344).

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

64497689736 is a wasteful number, since it uses less digits than its factorization.

64497689736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52334 (or 52330 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 69.

The spelling of 64497689736 in words is "sixty-four billion, four hundred ninety-seven million, six hundred eighty-nine thousand, seven hundred thirty-six".