251455135025 has 48 divisors (see below), whose sum is σ = 324351561600. Its totient is φ = 193149250560.

The previous prime is 251455135021. The next prime is 251455135031. The reversal of 251455135025 is 520531554152.

It is not a de Polignac number, because 251455135025 - 2² = 251455135021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251455135025.

It is not an unprimeable number, because it can be changed into a prime (251455135021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192390422 + ... + 192391728.

It is an arithmetic number, because the mean of its divisors is an integer number (6757324200).

Almost surely, 2^251455135025 is an apocalyptic number.

251455135025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251455135025 is a deficient number, since it is larger than the sum of its proper divisors (72896426575).

251455135025 is a wasteful number, since it uses less digits than its factorization.

251455135025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618 (or 2613 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 38.

Adding to 251455135025 its reverse (520531554152), we get a palindrome (771986689177).

The spelling of 251455135025 in words is "two hundred fifty-one billion, four hundred fifty-five million, one hundred thirty-five thousand, twenty-five".