66698943 has 8 divisors (see below), whose sum is σ = 88970928. Its totient is φ = 44446464.

The previous prime is 66698921. The next prime is 66698971. The reversal of 66698943 is 34989666.

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

It is not a de Polignac number, because 66698943 - 2¹² = 66694847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66698993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7855 + ... + 13967.

It is an arithmetic number, because the mean of its divisors is an integer number (11121366).

Almost surely, 2^66698943 is an apocalyptic number.

66698943 is a deficient number, since it is larger than the sum of its proper divisors (22271985).

66698943 is a wasteful number, since it uses less digits than its factorization.

66698943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9753.

The product of its digits is 1679616, while the sum is 51.

The square root of 66698943 is about 8166.9420837912. The cubic root of 66698943 is about 405.5455595404.

The spelling of 66698943 in words is "sixty-six million, six hundred ninety-eight thousand, nine hundred forty-three".