25436504251 has 2 divisors, whose sum is σ = 25436504252. Its totient is φ = 25436504250.

The previous prime is 25436504237. The next prime is 25436504329. The reversal of 25436504251 is 15240563452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25436504251 - 2²¹ = 25434407099 is a prime.

It is a super-2 number, since 2×25436504251² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25436504251.

It is not a weakly prime, because it can be changed into another prime (25436504231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12718252125 + 12718252126.

It is an arithmetic number, because the mean of its divisors is an integer number (12718252126).

Almost surely, 2^25436504251 is an apocalyptic number.

25436504251 is a deficient number, since it is larger than the sum of its proper divisors (1).

25436504251 is an equidigital number, since it uses as much as digits as its factorization.

25436504251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 25436504251 in words is "twenty-five billion, four hundred thirty-six million, five hundred four thousand, two hundred fifty-one".