25601005525 has 6 divisors (see below), whose sum is σ = 31745246882. Its totient is φ = 20480804400.

The previous prime is 25601005501. The next prime is 25601005541. The reversal of 25601005525 is 52550010652.

It can be written as a sum of positive squares in 3 ways, for example, as 6765201 + 25594240324 = 2601^2 + 159982^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25601005525 is a prime.

It is a super-2 number, since 2×25601005525² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 512020086 + ... + 512020135.

Almost surely, 2^25601005525 is an apocalyptic number.

25601005525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25601005525 is a deficient number, since it is larger than the sum of its proper divisors (6144241357).

25601005525 is a wasteful number, since it uses less digits than its factorization.

25601005525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024040231 (or 1024040226 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 25601005525 in words is "twenty-five billion, six hundred one million, five thousand, five hundred twenty-five".