66602906 has 8 divisors (see below), whose sum is σ = 105781140. Its totient is φ = 31342528.

The previous prime is 66602903. The next prime is 66602947. The reversal of 66602906 is 60920666.

It can be written as a sum of positive squares in 2 ways, for example, as 58140625 + 8462281 = 7625^2 + 2909^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66602903) 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, 979421 + ... + 979488.

Almost surely, 2^66602906 is an apocalyptic number.

66602906 is a deficient number, since it is larger than the sum of its proper divisors (39178234).

66602906 is a wasteful number, since it uses less digits than its factorization.

66602906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958928.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 66602906 is about 8161.0603477734. The cubic root of 66602906 is about 405.3508233871.

The spelling of 66602906 in words is "sixty-six million, six hundred two thousand, nine hundred six".