251866460159 has 4 divisors (see below), whose sum is σ = 266682134304. Its totient is φ = 237050786016.

The previous prime is 251866460137. The next prime is 251866460161. The reversal of 251866460159 is 951064668152.

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 251866460159 - 2²⁰ = 251865411583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251866460159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251866460129) 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, 7407837047 + ... + 7407837080.

It is an arithmetic number, because the mean of its divisors is an integer number (66670533576).

Almost surely, 2^251866460159 is an apocalyptic number.

251866460159 is a deficient number, since it is larger than the sum of its proper divisors (14815674145).

251866460159 is a wasteful number, since it uses less digits than its factorization.

251866460159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14815674144.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 251866460159 in words is "two hundred fifty-one billion, eight hundred sixty-six million, four hundred sixty thousand, one hundred fifty-nine".