251203540404 has 12 divisors (see below), whose sum is σ = 586141594304. Its totient is φ = 83734513464.

The previous prime is 251203540387. The next prime is 251203540457. The reversal of 251203540404 is 404045302152.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10466814172 + ... + 10466814195.

Almost surely, 2^251203540404 is an apocalyptic number.

It is an amenable number.

251203540404 is an abundant number, since it is smaller than the sum of its proper divisors (334938053900).

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

251203540404 is a wasteful number, since it uses less digits than its factorization.

251203540404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20933628374 (or 20933628372 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 251203540404 its reverse (404045302152), we get a palindrome (655248842556).

The spelling of 251203540404 in words is "two hundred fifty-one billion, two hundred three million, five hundred forty thousand, four hundred four".