251142744140 has 24 divisors (see below), whose sum is σ = 527450370720. Its totient is φ = 100447458048.

The previous prime is 251142744137. The next prime is 251142744143. The reversal of 251142744140 is 41447241152.

It is an interprime number because it is at equal distance from previous prime (251142744137) and next prime (251142744143).

It is a self number, because there is not a number n which added to its sum of digits gives 251142744140.

It is not an unprimeable number, because it can be changed into a prime (251142744143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386960 + ... + 807479.

It is an arithmetic number, because the mean of its divisors is an integer number (21977098780).

Almost surely, 2^251142744140 is an apocalyptic number.

251142744140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251142744140 is an abundant number, since it is smaller than the sum of its proper divisors (276307626580).

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

251142744140 is a wasteful number, since it uses less digits than its factorization.

251142744140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204961 (or 1204959 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 35.

Adding to 251142744140 its reverse (41447241152), we get a palindrome (292589985292).

The spelling of 251142744140 in words is "two hundred fifty-one billion, one hundred forty-two million, seven hundred forty-four thousand, one hundred forty".