66164906 has 4 divisors (see below), whose sum is σ = 99247362. Its totient is φ = 33082452.

The previous prime is 66164873. The next prime is 66164909. The reversal of 66164906 is 60946166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60946166 = 2 ⋅30473083.

It can be written as a sum of positive squares in only one way, i.e., 50993881 + 15171025 = 7141^2 + 3895^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66164906.

It is not an unprimeable number, because it can be changed into a prime (66164909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16541225 + ... + 16541228.

Almost surely, 2^66164906 is an apocalyptic number.

66164906 is a deficient number, since it is larger than the sum of its proper divisors (33082456).

66164906 is a wasteful number, since it uses less digits than its factorization.

66164906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33082455.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 66164906 is about 8134.1813355740. The cubic root of 66164906 is about 404.4603002736.

The spelling of 66164906 in words is "sixty-six million, one hundred sixty-four thousand, nine hundred six".