666667273394 has 8 divisors (see below), whose sum is σ = 1000098568560. Its totient is φ = 333301083876.

The previous prime is 666667273387. The next prime is 666667273423. The reversal of 666667273394 is 493372766666.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 666667273394.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16250804 + ... + 16291775.

It is an arithmetic number, because the mean of its divisors is an integer number (125012321070).

Almost surely, 2^666667273394 is an apocalyptic number.

666667273394 is a deficient number, since it is larger than the sum of its proper divisors (333431295166).

666667273394 is a wasteful number, since it uses less digits than its factorization.

666667273394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32552824.

The product of its digits is 246903552, while the sum is 65.

The spelling of 666667273394 in words is "six hundred sixty-six billion, six hundred sixty-seven million, two hundred seventy-three thousand, three hundred ninety-four".