251982503263 has 4 divisors (see below), whose sum is σ = 251993392920. Its totient is φ = 251971613608.

The previous prime is 251982503251. The next prime is 251982503341. The reversal of 251982503263 is 362305289152.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251982503263 - 2⁵ = 251982503231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251982503963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5410045 + ... + 5456422.

It is an arithmetic number, because the mean of its divisors is an integer number (62998348230).

Almost surely, 2^251982503263 is an apocalyptic number.

251982503263 is a deficient number, since it is larger than the sum of its proper divisors (10889657).

251982503263 is a wasteful number, since it uses less digits than its factorization.

251982503263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10889656.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 251982503263 in words is "two hundred fifty-one billion, nine hundred eighty-two million, five hundred three thousand, two hundred sixty-three".