66826197 has 6 divisors (see below), whose sum is σ = 96526742. Its totient is φ = 44550792.

The previous prime is 66826183. The next prime is 66826229. The reversal of 66826197 is 79162866.

It can be written as a sum of positive squares in only one way, i.e., 66732561 + 93636 = 8169^2 + 306^2 .

It is not a de Polignac number, because 66826197 - 2¹⁰ = 66825173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66826147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3712558 + ... + 3712575.

Almost surely, 2^66826197 is an apocalyptic number.

It is an amenable number.

66826197 is a deficient number, since it is larger than the sum of its proper divisors (29700545).

66826197 is a wasteful number, since it uses less digits than its factorization.

66826197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7425139 (or 7425136 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 66826197 is about 8174.7291698258. The cubic root of 66826197 is about 405.8033072986.

The spelling of 66826197 in words is "sixty-six million, eight hundred twenty-six thousand, one hundred ninety-seven".