2115566100 has 180 divisors, whose sum is σ = 6910842400. Its totient is φ = 559794240.

The previous prime is 2115566041. The next prime is 2115566111. The reversal of 2115566100 is 16655112.

It is a happy number.

2115566100 is a `hidden beast` number, since 2 + 1 + 1 + 556 + 6 + 100 = 666.

2115566100 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1124961 + ... + 1126839.

Almost surely, 2^2115566100 is an apocalyptic number.

2115566100 is a gapful number since it is divisible by the number (20) 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 2115566100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3455421200).

2115566100 is an abundant number, since it is smaller than the sum of its proper divisors (4795276300).

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

2115566100 is a wasteful number, since it uses less digits than its factorization.

2115566100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044 (or 2028 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 2115566100 is about 45995.2834538499. The cubic root of 2115566100 is about 1283.7354464126.

The spelling of 2115566100 in words is "two billion, one hundred fifteen million, five hundred sixty-six thousand, one hundred".