66789916 has 12 divisors (see below), whose sum is σ = 117385632. Its totient is φ = 33251168.

The previous prime is 66789901. The next prime is 66789941. The reversal of 66789916 is 61998766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34900 + ... + 36763.

It is an arithmetic number, because the mean of its divisors is an integer number (9782136).

Almost surely, 2^66789916 is an apocalyptic number.

It is an amenable number.

66789916 is a deficient number, since it is larger than the sum of its proper divisors (50595716).

66789916 is a wasteful number, since it uses less digits than its factorization.

66789916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71900 (or 71898 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 66789916 is about 8172.5097736252. The cubic root of 66789916 is about 405.7298549915.

The spelling of 66789916 in words is "sixty-six million, seven hundred eighty-nine thousand, nine hundred sixteen".