2101664656 has 80 divisors (see below), whose sum is σ = 5036149888. Its totient is φ = 827366400.

The previous prime is 2101664641. The next prime is 2101664683. The reversal of 2101664656 is 6564661012.

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, 303796 + ... + 310636.

Almost surely, 2^2101664656 is an apocalyptic number.

2101664656 is a gapful number since it is divisible by the number (26) 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 2101664656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2518074944).

2101664656 is an abundant number, since it is smaller than the sum of its proper divisors (2934485232).

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

2101664656 is a wasteful number, since it uses less digits than its factorization.

2101664656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080 (or 7074 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2101664656 is about 45843.9162375991. The cubic root of 2101664656 is about 1280.9174444749.

The spelling of 2101664656 in words is "two billion, one hundred one million, six hundred sixty-four thousand, six hundred fifty-six".