251212642774132 has 24 divisors (see below), whose sum is σ = 474493641741000. Its totient is φ = 115686068822016.

The previous prime is 251212642774129. The next prime is 251212642774139. The reversal of 251212642774132 is 231477246212152.

It can be written as a sum of positive squares in 4 ways, for example, as 4661220548196 + 246551422225936 = 2158986^2 + 15701956^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251212642774139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5379723157 + ... + 5379769852.

It is an arithmetic number, because the mean of its divisors is an integer number (19770568405875).

Almost surely, 2^{251212642774132} is an apocalyptic number.

It is an amenable number.

251212642774132 is a deficient number, since it is larger than the sum of its proper divisors (223280998966868).

251212642774132 is a wasteful number, since it uses less digits than its factorization.

251212642774132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10759493475 (or 10759493473 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 49.

Adding to 251212642774132 its reverse (231477246212152), we get a palindrome (482689888986284).

The spelling of 251212642774132 in words is "two hundred fifty-one trillion, two hundred twelve billion, six hundred forty-two million, seven hundred seventy-four thousand, one hundred thirty-two".