666819038 has 8 divisors (see below), whose sum is σ = 1000392120. Its totient is φ = 333355000.

The previous prime is 666819037. The next prime is 666819107. The reversal of 666819038 is 830918666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 666818983 and 666819001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666819037) 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, 9713 + ... + 37788.

It is an arithmetic number, because the mean of its divisors is an integer number (125049015).

Almost surely, 2^666819038 is an apocalyptic number.

666819038 is a deficient number, since it is larger than the sum of its proper divisors (333573082).

666819038 is a wasteful number, since it uses less digits than its factorization.

666819038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54522.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 666819038 is about 25822.8394643192. The cubic root of 666819038 is about 873.6470139766.

The spelling of 666819038 in words is "six hundred sixty-six million, eight hundred nineteen thousand, thirty-eight".