251056005583 has 4 divisors (see below), whose sum is σ = 251079195808. Its totient is φ = 251032815360.

The previous prime is 251056005509. The next prime is 251056005617. The reversal of 251056005583 is 385500650152.

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 251056005583 - 2⁹ = 251056005071 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 (251056009583) 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, 11578866 + ... + 11600527.

It is an arithmetic number, because the mean of its divisors is an integer number (62769798952).

Almost surely, 2^251056005583 is an apocalyptic number.

251056005583 is a deficient number, since it is larger than the sum of its proper divisors (23190225).

251056005583 is a wasteful number, since it uses less digits than its factorization.

251056005583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23190224.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 251056005583 in words is "two hundred fifty-one billion, fifty-six million, five thousand, five hundred eighty-three".