64861115660 has 96 divisors (see below), whose sum is σ = 149477638464. Its totient is φ = 23445504000.

The previous prime is 64861115659. The next prime is 64861115723. The reversal of 64861115660 is 6651116846.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56253644 + ... + 56254796.

It is an arithmetic number, because the mean of its divisors is an integer number (1557058734).

Almost surely, 2^64861115660 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 64861115660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74738819232).

64861115660 is an abundant number, since it is smaller than the sum of its proper divisors (84616522804).

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

64861115660 is a wasteful number, since it uses less digits than its factorization.

64861115660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 64861115660 in words is "sixty-four billion, eight hundred sixty-one million, one hundred fifteen thousand, six hundred sixty".