2251660321 has 16 divisors (see below), whose sum is σ = 2332882944. Its totient is φ = 2172178944.

The previous prime is 2251660309. The next prime is 2251660331. The reversal of 2251660321 is 1230661522.

It is a cyclic number.

It is not a de Polignac number, because 2251660321 - 2⁵ = 2251660289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2251660321.

It is not an unprimeable number, because it can be changed into a prime (2251660331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 836640 + ... + 839326.

It is an arithmetic number, because the mean of its divisors is an integer number (145805184).

Almost surely, 2^2251660321 is an apocalyptic number.

It is an amenable number.

2251660321 is a deficient number, since it is larger than the sum of its proper divisors (81222623).

2251660321 is a wasteful number, since it uses less digits than its factorization.

2251660321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2251660321 is about 47451.6629950943. The cubic root of 2251660321 is about 1310.6929342980.

The spelling of 2251660321 in words is "two billion, two hundred fifty-one million, six hundred sixty thousand, three hundred twenty-one".