2551660 has 12 divisors (see below), whose sum is σ = 5358528. Its totient is φ = 1020656.

The previous prime is 2551657. The next prime is 2551687. The reversal of 2551660 is 661552.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63772 + ... + 63811.

It is an arithmetic number, because the mean of its divisors is an integer number (446544).

2^2551660 is an apocalyptic number.

2551660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551660 is an abundant number, since it is smaller than the sum of its proper divisors (2806868).

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

2551660 is a wasteful number, since it uses less digits than its factorization.

2551660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127592 (or 127590 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2551660 is about 1597.3916238669. The cubic root of 2551660 is about 136.6493599606.

The spelling of 2551660 in words is "two million, five hundred fifty-one thousand, six hundred sixty".