10664721660 has 96 divisors (see below), whose sum is σ = 31488387840. Its totient is φ = 2689486848.

The previous prime is 10664721643. The next prime is 10664721737. The reversal of 10664721660 is 6612746601.

It is a super-2 number, since 2×10664721660² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 661212 + ... + 677148.

It is an arithmetic number, because the mean of its divisors is an integer number (328004040).

Almost surely, 2^10664721660 is an apocalyptic number.

10664721660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10664721660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15744193920).

10664721660 is an abundant number, since it is smaller than the sum of its proper divisors (20823666180).

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

10664721660 is a wasteful number, since it uses less digits than its factorization.

10664721660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16555 (or 16553 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 10664721660 in words is "ten billion, six hundred sixty-four million, seven hundred twenty-one thousand, six hundred sixty".