2001656600 has 24 divisors (see below), whose sum is σ = 4653852060. Its totient is φ = 800662560.

The previous prime is 2001656567. The next prime is 2001656603. The reversal of 2001656600 is 66561002.

It is a self number, because there is not a number n which added to its sum of digits gives 2001656600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001656603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5003942 + ... + 5004341.

Almost surely, 2^2001656600 is an apocalyptic number.

2001656600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001656600 is an abundant number, since it is smaller than the sum of its proper divisors (2652195460).

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

2001656600 is a wasteful number, since it uses less digits than its factorization.

2001656600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10008299 (or 10008290 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2001656600 is about 44739.8770673322. The cubic root of 2001656600 is about 1260.2688180956.

The spelling of 2001656600 in words is "two billion, one million, six hundred fifty-six thousand, six hundred".