668775405 has 16 divisors (see below), whose sum is σ = 1082934720. Its totient is φ = 352382208.

The previous prime is 668775397. The next prime is 668775449. The reversal of 668775405 is 504577866.

It is not a de Polignac number, because 668775405 - 2³ = 668775397 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267340 + ... + 269829.

It is an arithmetic number, because the mean of its divisors is an integer number (67683420).

Almost surely, 2^668775405 is an apocalyptic number.

It is an amenable number.

668775405 is a deficient number, since it is larger than the sum of its proper divisors (414159315).

668775405 is a wasteful number, since it uses less digits than its factorization.

668775405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537260.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The square root of 668775405 is about 25860.6922761167. The cubic root of 668775405 is about 874.5005715915.

The spelling of 668775405 in words is "six hundred sixty-eight million, seven hundred seventy-five thousand, four hundred five".