66694281 has 8 divisors (see below), whose sum is σ = 94156704. Its totient is φ = 41847360.

The previous prime is 66694223. The next prime is 66694297. The reversal of 66694281 is 18249666.

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

It is a de Polignac number, because none of the positive numbers 2^k-66694281 is a prime.

It is a super-2 number, since 2×66694281² = 8896254236213922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66694211) 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, 653815 + ... + 653916.

It is an arithmetic number, because the mean of its divisors is an integer number (11769588).

Almost surely, 2^66694281 is an apocalyptic number.

It is an amenable number.

66694281 is a deficient number, since it is larger than the sum of its proper divisors (27462423).

66694281 is a wasteful number, since it uses less digits than its factorization.

66694281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307751.

The product of its digits is 124416, while the sum is 42.

The square root of 66694281 is about 8166.6566598578. The cubic root of 66694281 is about 405.5361106278.

The spelling of 66694281 in words is "sixty-six million, six hundred ninety-four thousand, two hundred eighty-one".