66789616 has 10 divisors (see below), whose sum is σ = 129404912. Its totient is φ = 33394800.

The previous prime is 66789607. The next prime is 66789637. The reversal of 66789616 is 61698766.

It is a self number, because there is not a number n which added to its sum of digits gives 66789616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2087160 + ... + 2087191.

Almost surely, 2^66789616 is an apocalyptic number.

It is an amenable number.

66789616 is a deficient number, since it is larger than the sum of its proper divisors (62615296).

66789616 is a wasteful number, since it uses less digits than its factorization.

66789616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4174359 (or 4174353 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 66789616 is about 8172.4914193898. The cubic root of 66789616 is about 405.7292475188.

The spelling of 66789616 in words is "sixty-six million, seven hundred eighty-nine thousand, six hundred sixteen".