66662703109 has 4 divisors (see below), whose sum is σ = 70584038604. Its totient is φ = 62741367616.

The previous prime is 66662703097. The next prime is 66662703127. The reversal of 66662703109 is 90130726666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48070562500 + 18592140609 = 219250^2 + 136353^2 .

It is a cyclic number.

It is not a de Polignac number, because 66662703109 - 2⁵ = 66662703077 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 (66662703409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1960667722 + ... + 1960667755.

It is an arithmetic number, because the mean of its divisors is an integer number (17646009651).

Almost surely, 2^66662703109 is an apocalyptic number.

It is an amenable number.

66662703109 is a deficient number, since it is larger than the sum of its proper divisors (3921335495).

66662703109 is a wasteful number, since it uses less digits than its factorization.

66662703109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921335494.

The product of its (nonzero) digits is 489888, while the sum is 46.

The spelling of 66662703109 in words is "sixty-six billion, six hundred sixty-two million, seven hundred three thousand, one hundred nine".