666814734 has 32 divisors (see below), whose sum is σ = 1517957280. Its totient is φ = 216849600.

The previous prime is 666814727. The next prime is 666814751. The reversal of 666814734 is 437418666.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 666814734.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148377 + ... + 152804.

It is an arithmetic number, because the mean of its divisors is an integer number (47436165).

Almost surely, 2^666814734 is an apocalyptic number.

666814734 is an abundant number, since it is smaller than the sum of its proper divisors (851142546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666814734 is a wasteful number, since it uses less digits than its factorization.

666814734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301233 (or 301227 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 666814734 is about 25822.7561271062. The cubic root of 666814734 is about 873.6451343137.

The spelling of 666814734 in words is "six hundred sixty-six million, eight hundred fourteen thousand, seven hundred thirty-four".