25555275251 has 4 divisors (see below), whose sum is σ = 27878482104. Its totient is φ = 23232068400.

The previous prime is 25555275241. The next prime is 25555275259. The reversal of 25555275251 is 15257255552.

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-25555275251 is a prime.

It is a super-2 number, since 2×25555275251² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25555275259) 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, 1161603410 + ... + 1161603431.

It is an arithmetic number, because the mean of its divisors is an integer number (6969620526).

Almost surely, 2^25555275251 is an apocalyptic number.

25555275251 is a deficient number, since it is larger than the sum of its proper divisors (2323206853).

25555275251 is a wasteful number, since it uses less digits than its factorization.

25555275251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323206852.

The product of its digits is 875000, while the sum is 44.

The spelling of 25555275251 in words is "twenty-five billion, five hundred fifty-five million, two hundred seventy-five thousand, two hundred fifty-one".