251103020240 has 20 divisors (see below), whose sum is σ = 583814522244. Its totient is φ = 100441208064.

The previous prime is 251103020239. The next prime is 251103020263. The reversal of 251103020240 is 42020301152.

It can be written as a sum of positive squares in 2 ways, for example, as 185540393536 + 65562626704 = 430744^2 + 256052^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1569393797 + ... + 1569393956.

Almost surely, 2^251103020240 is an apocalyptic number.

251103020240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251103020240 is an abundant number, since it is smaller than the sum of its proper divisors (332711502004).

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

251103020240 is a wasteful number, since it uses less digits than its factorization.

251103020240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138787766 (or 3138787760 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 251103020240 its reverse (42020301152), we get a palindrome (293123321392).

The spelling of 251103020240 in words is "two hundred fifty-one billion, one hundred three million, twenty thousand, two hundred forty".