2551321563 has 48 divisors (see below), whose sum is σ = 4198293504. Its totient is φ = 1369401600.

The previous prime is 2551321559. The next prime is 2551321583. The reversal of 2551321563 is 3651231552.

It is a happy number.

It is not a de Polignac number, because 2551321563 - 2² = 2551321559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2551321583) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2216038 + ... + 2217188.

It is an arithmetic number, because the mean of its divisors is an integer number (87464448).

Almost surely, 2^2551321563 is an apocalyptic number.

2551321563 is a deficient number, since it is larger than the sum of its proper divisors (1646971941).

2551321563 is a wasteful number, since it uses less digits than its factorization.

2551321563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072 (or 2065 counting only the distinct ones).

The product of its digits is 27000, while the sum is 33.

The square root of 2551321563 is about 50510.6084204101. The cubic root of 2551321563 is about 1366.4331824083.

The spelling of 2551321563 in words is "two billion, five hundred fifty-one million, three hundred twenty-one thousand, five hundred sixty-three".