251416663 has 4 divisors (see below), whose sum is σ = 252922320. Its totient is φ = 249911008.

The previous prime is 251416651. The next prime is 251416673. The reversal of 251416663 is 366614152.

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 251416663 - 2¹³ = 251408471 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 (251416643) 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, 752578 + ... + 752911.

It is an arithmetic number, because the mean of its divisors is an integer number (63230580).

Almost surely, 2^251416663 is an apocalyptic number.

251416663 is a deficient number, since it is larger than the sum of its proper divisors (1505657).

251416663 is a wasteful number, since it uses less digits than its factorization.

251416663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505656.

The product of its digits is 25920, while the sum is 34.

The square root of 251416663 is about 15856.1238327657. The cubic root of 251416663 is about 631.1482067276.

The spelling of 251416663 in words is "two hundred fifty-one million, four hundred sixteen thousand, six hundred sixty-three".