66722186 has 12 divisors (see below), whose sum is σ = 105629202. Its totient is φ = 31604904.

The previous prime is 66722171. The next prime is 66722191. The reversal of 66722186 is 68122766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58049161 + 8673025 = 7619^2 + 2945^2 .

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45485 + ... + 46928.

Almost surely, 2^66722186 is an apocalyptic number.

66722186 is a deficient number, since it is larger than the sum of its proper divisors (38907016).

66722186 is a wasteful number, since it uses less digits than its factorization.

66722186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92453 (or 92434 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 66722186 is about 8168.3649526695. The cubic root of 66722186 is about 405.5926617397.

The spelling of 66722186 in words is "sixty-six million, seven hundred twenty-two thousand, one hundred eighty-six".