10661515664 has 40 divisors (see below), whose sum is σ = 21355651008. Its totient is φ = 5152291200.

The previous prime is 10661515549. The next prime is 10661515687. The reversal of 10661515664 is 46651516601.

It is a super-2 number, since 2×10661515664² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29759 + ... + 149025.

Almost surely, 2^10661515664 is an apocalyptic number.

It is an amenable number.

10661515664 is an abundant number, since it is smaller than the sum of its proper divisors (10694135344).

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

10661515664 is a wasteful number, since it uses less digits than its factorization.

10661515664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119463 (or 119457 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 10661515664 in words is "ten billion, six hundred sixty-one million, five hundred fifteen thousand, six hundred sixty-four".