25505305525 has 24 divisors (see below), whose sum is σ = 36913708800. Its totient is φ = 17117232960.

The previous prime is 25505305523. The next prime is 25505305541. The reversal of 25505305525 is 52550350552.

It is a happy number.

It is not a de Polignac number, because 25505305525 - 2¹ = 25505305523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505305523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1542250 + ... + 1558699.

It is an arithmetic number, because the mean of its divisors is an integer number (1538071200).

Almost surely, 2^25505305525 is an apocalyptic number.

25505305525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25505305525 is a deficient number, since it is larger than the sum of its proper divisors (11408403275).

25505305525 is a wasteful number, since it uses less digits than its factorization.

25505305525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101013 (or 3101008 counting only the distinct ones).

The product of its (nonzero) digits is 187500, while the sum is 37.

The spelling of 25505305525 in words is "twenty-five billion, five hundred five million, three hundred five thousand, five hundred twenty-five".