2551963321 has 16 divisors (see below), whose sum is σ = 2805580800. Its totient is φ = 2310465168.

The previous prime is 2551963319. The next prime is 2551963339. The reversal of 2551963321 is 1233691552.

It is a cyclic number.

It is not a de Polignac number, because 2551963321 - 2¹ = 2551963319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551963391) 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, 705700 + ... + 709306.

It is an arithmetic number, because the mean of its divisors is an integer number (175348800).

Almost surely, 2^2551963321 is an apocalyptic number.

It is an amenable number.

2551963321 is a deficient number, since it is larger than the sum of its proper divisors (253617479).

2551963321 is a wasteful number, since it uses less digits than its factorization.

2551963321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268.

The product of its digits is 48600, while the sum is 37.

The square root of 2551963321 is about 50516.9607260769. The cubic root of 2551963321 is about 1366.5477434162.

The spelling of 2551963321 in words is "two billion, five hundred fifty-one million, nine hundred sixty-three thousand, three hundred twenty-one".