251240420425 has 24 divisors (see below), whose sum is σ = 318855405440. Its totient is φ = 196273627200.

The previous prime is 251240420393. The next prime is 251240420477. The reversal of 251240420425 is 524024042152.

251240420425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 251240420425 - 2⁵ = 251240420393 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5201536 + ... + 5249614.

Almost surely, 2^251240420425 is an apocalyptic number.

251240420425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251240420425 is a deficient number, since it is larger than the sum of its proper divisors (67614985015).

251240420425 is a wasteful number, since it uses less digits than its factorization.

251240420425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52993 (or 52988 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 251240420425 its reverse (524024042152), we get a palindrome (775264462577).

The spelling of 251240420425 in words is "two hundred fifty-one billion, two hundred forty million, four hundred twenty thousand, four hundred twenty-five".