66992186 has 4 divisors (see below), whose sum is σ = 100488282. Its totient is φ = 33496092.

The previous prime is 66992143. The next prime is 66992197. The reversal of 66992186 is 68129966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68129966 = 2 ⋅34064983.

It can be written as a sum of positive squares in only one way, i.e., 34445161 + 32547025 = 5869^2 + 5705^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66992186.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16748045 + ... + 16748048.

Almost surely, 2^66992186 is an apocalyptic number.

66992186 is a deficient number, since it is larger than the sum of its proper divisors (33496096).

66992186 is a wasteful number, since it uses less digits than its factorization.

66992186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33496095.

The product of its digits is 279936, while the sum is 47.

The square root of 66992186 is about 8184.8754419356. The cubic root of 66992186 is about 406.1390199099.

The spelling of 66992186 in words is "sixty-six million, nine hundred ninety-two thousand, one hundred eighty-six".