2561620625725 has 24 divisors (see below), whose sum is σ = 3630852138368. Its totient is φ = 1756215777600.

The previous prime is 2561620625687. The next prime is 2561620625747. The reversal of 2561620625725 is 5275260261652.

2561620625725 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561620625725 - 2²⁹ = 2561083754813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397194 + ... + 2298043.

Almost surely, 2^{2561620625725} is an apocalyptic number.

2561620625725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2561620625725 is a deficient number, since it is larger than the sum of its proper divisors (1069231512643).

2561620625725 is a wasteful number, since it uses less digits than its factorization.

2561620625725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700685 (or 2700680 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 49.

The spelling of 2561620625725 in words is "two trillion, five hundred sixty-one billion, six hundred twenty million, six hundred twenty-five thousand, seven hundred twenty-five".