2566561715 has 4 divisors (see below), whose sum is σ = 3079874064. Its totient is φ = 2053249368.

The previous prime is 2566561687. The next prime is 2566561783. The reversal of 2566561715 is 5171656652.

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 2566561715 - 2²² = 2562367411 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256656167 + ... + 256656176.

It is an arithmetic number, because the mean of its divisors is an integer number (769968516).

Almost surely, 2^2566561715 is an apocalyptic number.

2566561715 is a deficient number, since it is larger than the sum of its proper divisors (513312349).

2566561715 is an equidigital number, since it uses as much as digits as its factorization.

2566561715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513312348.

The product of its digits is 378000, while the sum is 44.

The square root of 2566561715 is about 50661.2447044089. The cubic root of 2566561715 is about 1369.1485492029.

The spelling of 2566561715 in words is "two billion, five hundred sixty-six million, five hundred sixty-one thousand, seven hundred fifteen".