2551172660 has 48 divisors (see below), whose sum is σ = 5741015616. Its totient is φ = 948859392.

The previous prime is 2551172647. The next prime is 2551172669. The reversal of 2551172660 is 662711552.

It is a super-2 number, since 2×2551172660² = 13016963882262951200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2551172660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551172669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16982 + ... + 73421.

It is an arithmetic number, because the mean of its divisors is an integer number (119604492).

Almost surely, 2^2551172660 is an apocalyptic number.

2551172660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551172660 is an abundant number, since it is smaller than the sum of its proper divisors (3189842956).

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

2551172660 is a wasteful number, since it uses less digits than its factorization.

2551172660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90512 (or 90510 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 2551172660 is about 50509.1344214094. The cubic root of 2551172660 is about 1366.4065988053.

It can be divided in two parts, 255117 and 2660, that multiplied together give a triangular number (678611220 = T₃₆₈₄₀).

The spelling of 2551172660 in words is "two billion, five hundred fifty-one million, one hundred seventy-two thousand, six hundred sixty".