2561256612 has 30 divisors (see below), whose sum is σ = 6695631558. Its totient is φ = 853752096.

The previous prime is 2561256553. The next prime is 2561256613. The reversal of 2561256612 is 2166521652.

2561256612 is a `hidden beast` number, since 2 + 561 + 25 + 66 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2349728676 + 211527936 = 48474^2 + 14544^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2561256613) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3952233 + ... + 3952880.

Almost surely, 2^2561256612 is an apocalyptic number.

It is an amenable number.

2561256612 is an abundant number, since it is smaller than the sum of its proper divisors (4134374946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561256612 is a wasteful number, since it uses less digits than its factorization.

2561256612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7905129 (or 7905118 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 2561256612 is about 50608.8590268542. The cubic root of 2561256612 is about 1368.2045515918.

The spelling of 2561256612 in words is "two billion, five hundred sixty-one million, two hundred fifty-six thousand, six hundred twelve".