66305506 has 4 divisors (see below), whose sum is σ = 99458262. Its totient is φ = 33152752.

The previous prime is 66305489. The next prime is 66305507. The reversal of 66305506 is 60550366.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 58660281 + 7645225 = 7659^2 + 2765^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66305507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16576375 + ... + 16576378.

Almost surely, 2^66305506 is an apocalyptic number.

66305506 is a deficient number, since it is larger than the sum of its proper divisors (33152756).

66305506 is a wasteful number, since it uses less digits than its factorization.

66305506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33152755.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 66305506 is about 8142.8192906388. The cubic root of 66305506 is about 404.7465894279.

The spelling of 66305506 in words is "sixty-six million, three hundred five thousand, five hundred six".