25617512061 has 40 divisors (see below), whose sum is σ = 38521833944. Its totient is φ = 16965521280.

The previous prime is 25617512057. The next prime is 25617512083. The reversal of 25617512061 is 16021571652.

25617512061 is a `hidden beast` number, since 2 + 561 + 75 + 1 + 20 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6322635225 + 19294876836 = 79515^2 + 138906^2 .

It is not a de Polignac number, because 25617512061 - 2² = 25617512057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25617517061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8367471 + ... + 8370531.

Almost surely, 2^25617512061 is an apocalyptic number.

It is an amenable number.

25617512061 is a deficient number, since it is larger than the sum of its proper divisors (12904321883).

25617512061 is a wasteful number, since it uses less digits than its factorization.

25617512061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3723 (or 3714 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 25617512061 in words is "twenty-five billion, six hundred seventeen million, five hundred twelve thousand, sixty-one".