66621196 has 12 divisors (see below), whose sum is σ = 117677448. Its totient is φ = 32999072.

The previous prime is 66621169. The next prime is 66621199. The reversal of 66621196 is 69112666.

It is not an unprimeable number, because it can be changed into a prime (66621199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77401 + ... + 78256.

It is an arithmetic number, because the mean of its divisors is an integer number (9806454).

Almost surely, 2^66621196 is an apocalyptic number.

It is an amenable number.

66621196 is a deficient number, since it is larger than the sum of its proper divisors (51056252).

66621196 is a wasteful number, since it uses less digits than its factorization.

66621196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155768 (or 155766 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 66621196 is about 8162.1808360266. The cubic root of 66621196 is about 405.3879248114.

The spelling of 66621196 in words is "sixty-six million, six hundred twenty-one thousand, one hundred ninety-six".