666883834 has 4 divisors (see below), whose sum is σ = 1000325754. Its totient is φ = 333441916.

The previous prime is 666883829. The next prime is 666883849. The reversal of 666883834 is 438388666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 438388666 = 2 ⋅219194333.

It can be written as a sum of positive squares in only one way, i.e., 638825625 + 28058209 = 25275^2 + 5297^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166720957 + ... + 166720960.

Almost surely, 2^666883834 is an apocalyptic number.

666883834 is a deficient number, since it is larger than the sum of its proper divisors (333441920).

666883834 is a wasteful number, since it uses less digits than its factorization.

666883834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333441919.

The product of its digits is 3981312, while the sum is 52.

The square root of 666883834 is about 25824.0940596180. The cubic root of 666883834 is about 873.6753110083.

The spelling of 666883834 in words is "six hundred sixty-six million, eight hundred eighty-three thousand, eight hundred thirty-four".