251155201244 has 48 divisors (see below), whose sum is σ = 452644624320. Its totient is φ = 121936501440.

The previous prime is 251155201229. The next prime is 251155201247. The reversal of 251155201244 is 442102551152.

251155201244 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×251155201244² (a number of 24 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 251155201244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251155201247) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 137167409 + ... + 137169239.

It is an arithmetic number, because the mean of its divisors is an integer number (9430096340).

Almost surely, 2^251155201244 is an apocalyptic number.

It is an amenable number.

251155201244 is a deficient number, since it is larger than the sum of its proper divisors (201489423076).

251155201244 is an equidigital number, since it uses as much as digits as its factorization.

251155201244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 251155201244 its reverse (442102551152), we get a palindrome (693257752396).

The spelling of 251155201244 in words is "two hundred fifty-one billion, one hundred fifty-five million, two hundred one thousand, two hundred forty-four".