251220301355225 has 24 divisors (see below), whose sum is σ = 312120136470240. Its totient is φ = 200584674576000.

The previous prime is 251220301355213. The next prime is 251220301355237. The reversal of 251220301355225 is 522553103022152.

It is an interprime number because it is at equal distance from previous prime (251220301355213) and next prime (251220301355237).

It is not a de Polignac number, because 251220301355225 - 2⁸ = 251220301354969 is a prime.

It is a super-2 number, since 2×251220301355225² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 480765146 + ... + 481287404.

It is an arithmetic number, because the mean of its divisors is an integer number (13005005686260).

Almost surely, 2^{251220301355225} is an apocalyptic number.

251220301355225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251220301355225 is a deficient number, since it is larger than the sum of its proper divisors (60899835115015).

251220301355225 is a wasteful number, since it uses less digits than its factorization.

251220301355225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559721 (or 559716 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 251220301355225 its reverse (522553103022152), we get a palindrome (773773404377377).

The spelling of 251220301355225 in words is "two hundred fifty-one trillion, two hundred twenty billion, three hundred one million, three hundred fifty-five thousand, two hundred twenty-five".