251423252532 has 60 divisors (see below), whose sum is σ = 673301058276. Its totient is φ = 81763655040.

The previous prime is 251423252519. The next prime is 251423252533. The reversal of 251423252532 is 235252324152.

It is a happy number.

251423252532 is a `hidden beast` number, since 2 + 5 + 1 + 42 + 32 + 52 + 532 = 666.

251423252532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 102863884176 + 148559368356 = 320724^2 + 385434^2 .

It is a super-2 number, since 2×251423252532² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251423252533) 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 19 ways as a sum of consecutive naturals, for example, 9450103 + ... + 9476670.

Almost surely, 2^251423252532 is an apocalyptic number.

It is an amenable number.

251423252532 is an abundant number, since it is smaller than the sum of its proper divisors (421877805744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251423252532 is a wasteful number, since it uses less digits than its factorization.

251423252532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18926830 (or 18926819 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

Adding to 251423252532 its reverse (235252324152), we get a palindrome (486675576684).

The spelling of 251423252532 in words is "two hundred fifty-one billion, four hundred twenty-three million, two hundred fifty-two thousand, five hundred thirty-two".