2563511561 has 8 divisors (see below), whose sum is σ = 2761102344. Its totient is φ = 2365977600.

The previous prime is 2563511557. The next prime is 2563511567. The reversal of 2563511561 is 1651153652.

It can be written as a sum of positive squares in 4 ways, for example, as 14776336 + 2548735225 = 3844^2 + 50485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2563511561 - 2² = 2563511557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2563511567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149111 + ... + 165411.

It is an arithmetic number, because the mean of its divisors is an integer number (345137793).

Almost surely, 2^2563511561 is an apocalyptic number.

It is an amenable number.

2563511561 is a deficient number, since it is larger than the sum of its proper divisors (197590783).

2563511561 is a wasteful number, since it uses less digits than its factorization.

2563511561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28411.

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

The square root of 2563511561 is about 50631.1323298225. The cubic root of 2563511561 is about 1368.6059595691.

The spelling of 2563511561 in words is "two billion, five hundred sixty-three million, five hundred eleven thousand, five hundred sixty-one".