25440145253 has 4 divisors (see below), whose sum is σ = 25452697920. Its totient is φ = 25427592588.

The previous prime is 25440145249. The next prime is 25440145271. The reversal of 25440145253 is 35254104452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25440145253 - 2² = 25440145249 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 (25440145243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6273293 + ... + 6277346.

It is an arithmetic number, because the mean of its divisors is an integer number (6363174480).

Almost surely, 2^25440145253 is an apocalyptic number.

It is an amenable number.

25440145253 is a deficient number, since it is larger than the sum of its proper divisors (12552667).

25440145253 is a wasteful number, since it uses less digits than its factorization.

25440145253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12552666.

The product of its (nonzero) digits is 96000, while the sum is 35.

The spelling of 25440145253 in words is "twenty-five billion, four hundred forty million, one hundred forty-five thousand, two hundred fifty-three".