66694489 has 4 divisors (see below), whose sum is σ = 67633920. Its totient is φ = 65755060.

The previous prime is 66694487. The next prime is 66694493. The reversal of 66694489 is 98449666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66694489 - 2¹ = 66694487 is a prime.

It is a super-2 number, since 2×66694489² = 8896309725942242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66694483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469609 + ... + 469750.

It is an arithmetic number, because the mean of its divisors is an integer number (16908480).

Almost surely, 2^66694489 is an apocalyptic number.

It is an amenable number.

66694489 is a deficient number, since it is larger than the sum of its proper divisors (939431).

66694489 is an equidigital number, since it uses as much as digits as its factorization.

66694489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939430.

The product of its digits is 2239488, while the sum is 52.

The square root of 66694489 is about 8166.6693945574. The cubic root of 66694489 is about 405.5365322103.

The spelling of 66694489 in words is "sixty-six million, six hundred ninety-four thousand, four hundred eighty-nine".