2561236425 has 72 divisors (see below), whose sum is σ = 5024410560. Its totient is φ = 1236873600.

The previous prime is 2561236411. The next prime is 2561236429. The reversal of 2561236425 is 5246321652.

2561236425 is a `hidden beast` number, since 2 + 5 + 6 + 1 + 2 + 3 + 642 + 5 = 666.

2561236425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561236425 - 2⁶ = 2561236361 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2561236425.

It is not an unprimeable number, because it can be changed into a prime (2561236429) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 663852 + ... + 667698.

It is an arithmetic number, because the mean of its divisors is an integer number (69783480).

Almost surely, 2^2561236425 is an apocalyptic number.

2561236425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2561236425 is a deficient number, since it is larger than the sum of its proper divisors (2463174135).

2561236425 is a wasteful number, since it uses less digits than its factorization.

2561236425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4143 (or 4135 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 2561236425 is about 50608.6595850947. The cubic root of 2561236425 is about 1368.2009569998.

The spelling of 2561236425 in words is "two billion, five hundred sixty-one million, two hundred thirty-six thousand, four hundred twenty-five".