66694489311 has 4 divisors (see below), whose sum is σ = 88925985752. Its totient is φ = 44462992872.

The previous prime is 66694489241. The next prime is 66694489327. The reversal of 66694489311 is 11398449666.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66694489311 - 2⁹ = 66694488799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66694482311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11115748216 + ... + 11115748221.

It is an arithmetic number, because the mean of its divisors is an integer number (22231496438).

Almost surely, 2^66694489311 is an apocalyptic number.

66694489311 is a deficient number, since it is larger than the sum of its proper divisors (22231496441).

66694489311 is a wasteful number, since it uses less digits than its factorization.

66694489311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22231496440.

The product of its digits is 6718464, while the sum is 57.

The spelling of 66694489311 in words is "sixty-six billion, six hundred ninety-four million, four hundred eighty-nine thousand, three hundred eleven".