25238315251 has 2 divisors, whose sum is σ = 25238315252. Its totient is φ = 25238315250.

The previous prime is 25238315227. The next prime is 25238315281. The reversal of 25238315251 is 15251383252.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25238315251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25238315251.

It is not a weakly prime, because it can be changed into another prime (25238315281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12619157625 + 12619157626.

It is an arithmetic number, because the mean of its divisors is an integer number (12619157626).

Almost surely, 2^25238315251 is an apocalyptic number.

25238315251 is the 100476-th centered pentagonal number.

25238315251 is a deficient number, since it is larger than the sum of its proper divisors (1).

25238315251 is an equidigital number, since it uses as much as digits as its factorization.

25238315251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 37.

The spelling of 25238315251 in words is "twenty-five billion, two hundred thirty-eight million, three hundred fifteen thousand, two hundred fifty-one".