268640663 has 4 divisors (see below), whose sum is σ = 271018128. Its totient is φ = 266263200.

The previous prime is 268640633. The next prime is 268640707. The reversal of 268640663 is 366046862.

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 268640663 - 2²² = 264446359 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 268640663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268640633) 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, 1188563 + ... + 1188788.

It is an arithmetic number, because the mean of its divisors is an integer number (67754532).

Almost surely, 2^268640663 is an apocalyptic number.

268640663 is a deficient number, since it is larger than the sum of its proper divisors (2377465).

268640663 is a wasteful number, since it uses less digits than its factorization.

268640663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377464.

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 268640663 is about 16390.2612242758. The cubic root of 268640663 is about 645.2439139191.

The spelling of 268640663 in words is "two hundred sixty-eight million, six hundred forty thousand, six hundred sixty-three".