2561516315 has 4 divisors (see below), whose sum is σ = 3073819584. Its totient is φ = 2049213048.

The previous prime is 2561516311. The next prime is 2561516317. The reversal of 2561516315 is 5136151652.

2561516315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2561516315 - 2² = 2561516311 is a prime.

It is a super-2 number, since 2×2561516315² = 13122731664022358450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561516311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256151627 + ... + 256151636.

It is an arithmetic number, because the mean of its divisors is an integer number (768454896).

Almost surely, 2^2561516315 is an apocalyptic number.

2561516315 is a deficient number, since it is larger than the sum of its proper divisors (512303269).

2561516315 is an equidigital number, since it uses as much as digits as its factorization.

2561516315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512303268.

The product of its digits is 27000, while the sum is 35.

The square root of 2561516315 is about 50611.4247477780. The cubic root of 2561516315 is about 1368.2507938434.

Adding to 2561516315 its reverse (5136151652), we get a palindrome (7697667967).

The spelling of 2561516315 in words is "two billion, five hundred sixty-one million, five hundred sixteen thousand, three hundred fifteen".