25520253251 has 4 divisors (see below), whose sum is σ = 25520958912. Its totient is φ = 25519547592.

The previous prime is 25520253211. The next prime is 25520253263. The reversal of 25520253251 is 15235202552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25520253251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25520253211) 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, 295475 + ... + 371948.

It is an arithmetic number, because the mean of its divisors is an integer number (6380239728).

Almost surely, 2^25520253251 is an apocalyptic number.

25520253251 is a deficient number, since it is larger than the sum of its proper divisors (705661).

25520253251 is an equidigital number, since it uses as much as digits as its factorization.

25520253251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705660.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 25520253251 in words is "twenty-five billion, five hundred twenty million, two hundred fifty-three thousand, two hundred fifty-one".