66266506 has 4 divisors (see below), whose sum is σ = 99399762. Its totient is φ = 33133252.

The previous prime is 66266503. The next prime is 66266507. The reversal of 66266506 is 60566266.

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., 47265625 + 19000881 = 6875^2 + 4359^2 .

It is not an unprimeable number, because it can be changed into a prime (66266503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16566625 + ... + 16566628.

Almost surely, 2^66266506 is an apocalyptic number.

66266506 is a deficient number, since it is larger than the sum of its proper divisors (33133256).

66266506 is a wasteful number, since it uses less digits than its factorization.

66266506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33133255.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 66266506 is about 8140.4241904215. The cubic root of 66266506 is about 404.6672183780.

The spelling of 66266506 in words is "sixty-six million, two hundred sixty-six thousand, five hundred six".