66672957789 has 16 divisors (see below), whose sum is σ = 100025068800. Its totient is φ = 43885996128.

The previous prime is 66672957787. The next prime is 66672957803. The reversal of 66672957789 is 98775927666.

It is not a de Polignac number, because 66672957789 - 2¹ = 66672957787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66672957787) 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 15 ways as a sum of consecutive naturals, for example, 15626784 + ... + 15631049.

It is an arithmetic number, because the mean of its divisors is an integer number (6251566800).

Almost surely, 2^66672957789 is an apocalyptic number.

It is an amenable number.

66672957789 is a deficient number, since it is larger than the sum of its proper divisors (33352111011).

66672957789 is a wasteful number, since it uses less digits than its factorization.

66672957789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31257921 (or 31257915 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 72.

The spelling of 66672957789 in words is "sixty-six billion, six hundred seventy-two million, nine hundred fifty-seven thousand, seven hundred eighty-nine".