251833942040 has 64 divisors (see below), whose sum is σ = 573609254400. Its totient is φ = 99492838272.

The previous prime is 251833942037. The next prime is 251833942091. The reversal of 251833942040 is 40249338152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15871631 + ... + 15887489.

It is an arithmetic number, because the mean of its divisors is an integer number (8962644600).

Almost surely, 2^251833942040 is an apocalyptic number.

251833942040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251833942040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286804627200).

251833942040 is an abundant number, since it is smaller than the sum of its proper divisors (321775312360).

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

251833942040 is a wasteful number, since it uses less digits than its factorization.

251833942040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20736 (or 20732 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 251833942040 in words is "two hundred fifty-one billion, eight hundred thirty-three million, nine hundred forty-two thousand, forty".