666783814 has 4 divisors (see below), whose sum is σ = 1000175724. Its totient is φ = 333391906.

The previous prime is 666783811. The next prime is 666783827. The reversal of 666783814 is 418387666.

666783814 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×666783814² = 889201309224773192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666783811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166695952 + ... + 166695955.

It is an arithmetic number, because the mean of its divisors is an integer number (250043931).

Almost surely, 2^666783814 is an apocalyptic number.

666783814 is a deficient number, since it is larger than the sum of its proper divisors (333391910).

666783814 is a wasteful number, since it uses less digits than its factorization.

666783814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333391909.

The product of its digits is 1161216, while the sum is 49.

The square root of 666783814 is about 25822.1574234222. The cubic root of 666783814 is about 873.6316305504.

The spelling of 666783814 in words is "six hundred sixty-six million, seven hundred eighty-three thousand, eight hundred fourteen".