251240532453 has 24 divisors (see below), whose sum is σ = 378851361408. Its totient is φ = 160139440032.

The previous prime is 251240532427. The next prime is 251240532503. The reversal of 251240532453 is 354235042152.

251240532453 is a `hidden beast` number, since 2 + 5 + 1 + 2 + 405 + 3 + 245 + 3 = 666.

It is not a de Polignac number, because 251240532453 - 2⁸ = 251240532197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251240532553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191776 + ... + 734342.

It is an arithmetic number, because the mean of its divisors is an integer number (15785473392).

Almost surely, 2^251240532453 is an apocalyptic number.

251240532453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

251240532453 is a deficient number, since it is larger than the sum of its proper divisors (127610828955).

251240532453 is a wasteful number, since it uses less digits than its factorization.

251240532453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544833 (or 544830 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 251240532453 in words is "two hundred fifty-one billion, two hundred forty million, five hundred thirty-two thousand, four hundred fifty-three".