66986713790 has 16 divisors (see below), whose sum is σ = 121769909280. Its totient is φ = 26529391200.

The previous prime is 66986713777. The next prime is 66986713799. The reversal of 66986713790 is 9731768966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66986713799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33160730 + ... + 33162749.

It is an arithmetic number, because the mean of its divisors is an integer number (7610619330).

Almost surely, 2^66986713790 is an apocalyptic number.

66986713790 is a deficient number, since it is larger than the sum of its proper divisors (54783195490).

66986713790 is a wasteful number, since it uses less digits than its factorization.

66986713790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66323587.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The spelling of 66986713790 in words is "sixty-six billion, nine hundred eighty-six million, seven hundred thirteen thousand, seven hundred ninety".