66197616 has 40 divisors (see below), whose sum is σ = 175186704. Its totient is φ = 21527040.

The previous prime is 66197603. The next prime is 66197623. The reversal of 66197616 is 61679166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14851 + ... + 18786.

Almost surely, 2^66197616 is an apocalyptic number.

It is an amenable number.

66197616 is an abundant number, since it is smaller than the sum of its proper divisors (108989088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66197616 is a wasteful number, since it uses less digits than its factorization.

66197616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33689 (or 33683 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 66197616 is about 8136.1917381537. The cubic root of 66197616 is about 404.5269404189.

The spelling of 66197616 in words is "sixty-six million, one hundred ninety-seven thousand, six hundred sixteen".