251444404532142 has 48 divisors (see below), whose sum is σ = 553273145880000. Its totient is φ = 82516737431232.

The previous prime is 251444404532117. The next prime is 251444404532179. The reversal of 251444404532142 is 241235404444152.

251444404532142 is a `hidden beast` number, since 2 + 5 + 14 + 4 + 4 + 40 + 453 + 2 + 142 = 666.

It is a super-2 number, since 2×251444404532142² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

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, 252833917 + ... + 253826472.

It is an arithmetic number, because the mean of its divisors is an integer number (11526523872500).

Almost surely, 2^{251444404532142} is an apocalyptic number.

251444404532142 is an abundant number, since it is smaller than the sum of its proper divisors (301828741347858).

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

251444404532142 is a wasteful number, since it uses less digits than its factorization.

251444404532142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506660825 (or 506660822 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 45.

Adding to 251444404532142 its reverse (241235404444152), we get a palindrome (492679808976294).

The spelling of 251444404532142 in words is "two hundred fifty-one trillion, four hundred forty-four billion, four hundred four million, five hundred thirty-two thousand, one hundred forty-two".