2251666020 has 48 divisors (see below), whose sum is σ = 6391042560. Its totient is φ = 592217856.

The previous prime is 2251666013. The next prime is 2251666049. The reversal of 2251666020 is 206661522.

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

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, 252660 + ... + 261419.

It is an arithmetic number, because the mean of its divisors is an integer number (133146720).

Almost surely, 2^2251666020 is an apocalyptic number.

2251666020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2251666020 is an abundant number, since it is smaller than the sum of its proper divisors (4139376540).

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

2251666020 is a wasteful number, since it uses less digits than its factorization.

2251666020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514164 (or 514162 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 2251666020 is about 47451.7230456387. The cubic root of 2251666020 is about 1310.6940400943.

The spelling of 2251666020 in words is "two billion, two hundred fifty-one million, six hundred sixty-six thousand, twenty".