2011666620 has 48 divisors (see below), whose sum is σ = 5651065728. Its totient is φ = 534692160.

The previous prime is 2011666609. The next prime is 2011666651. The reversal of 2011666620 is 266661102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 36186 + ... + 73025.

It is an arithmetic number, because the mean of its divisors is an integer number (117730536).

Almost surely, 2^2011666620 is an apocalyptic number.

2011666620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011666620 is an abundant number, since it is smaller than the sum of its proper divisors (3639399108).

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

2011666620 is a wasteful number, since it uses less digits than its factorization.

2011666620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109530 (or 109528 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 2011666620 is about 44851.6066601855. The cubic root of 2011666620 is about 1262.3661384067.

It can be divided in two parts, 20116 and 66620, that added together give a triangular number (86736 = T₄₁₆).

The spelling of 2011666620 in words is "two billion, eleven million, six hundred sixty-six thousand, six hundred twenty".