666516694 has 8 divisors (see below), whose sum is σ = 1052394840. Its totient is φ = 315718416.

The previous prime is 666516679. The next prime is 666516731. The reversal of 666516694 is 496615666.

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

It is a congruent number.

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, 8769919 + ... + 8769994.

It is an arithmetic number, because the mean of its divisors is an integer number (131549355).

Almost surely, 2^666516694 is an apocalyptic number.

666516694 is a deficient number, since it is larger than the sum of its proper divisors (385878146).

666516694 is a wasteful number, since it uses less digits than its factorization.

666516694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17539934.

The product of its digits is 1399680, while the sum is 49.

The square root of 666516694 is about 25816.9846031639. The cubic root of 666516694 is about 873.5149532277.

The spelling of 666516694 in words is "six hundred sixty-six million, five hundred sixteen thousand, six hundred ninety-four".