251300005040 has 40 divisors (see below), whose sum is σ = 667740014880. Its totient is φ = 86160001536.

The previous prime is 251300005031. The next prime is 251300005043. The reversal of 251300005040 is 40500003152.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is not an unprimeable number, because it can be changed into a prime (251300005043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224374445 + ... + 224375564.

It is an arithmetic number, because the mean of its divisors is an integer number (16693500372).

Almost surely, 2^251300005040 is an apocalyptic number.

251300005040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251300005040 is an abundant number, since it is smaller than the sum of its proper divisors (416440009840).

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

251300005040 is a wasteful number, since it uses less digits than its factorization.

251300005040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448750029 (or 448750023 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 251300005040 its reverse (40500003152), we get a palindrome (291800008192).

The spelling of 251300005040 in words is "two hundred fifty-one billion, three hundred million, five thousand, forty".