66665698 has 8 divisors (see below), whose sum is σ = 109089360. Its totient is φ = 30302580.

The previous prime is 66665657. The next prime is 66665701. The reversal of 66665698 is 89656666.

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

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, 1515108 + ... + 1515151.

It is an arithmetic number, because the mean of its divisors is an integer number (13636170).

Almost surely, 2^66665698 is an apocalyptic number.

66665698 is a deficient number, since it is larger than the sum of its proper divisors (42423662).

66665698 is a wasteful number, since it uses less digits than its factorization.

66665698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030272.

The product of its digits is 2799360, while the sum is 52.

The square root of 66665698 is about 8164.9064905852. The cubic root of 66665698 is about 405.4781691533.

The spelling of 66665698 in words is "sixty-six million, six hundred sixty-five thousand, six hundred ninety-eight".