636242066 has 4 divisors (see below), whose sum is σ = 954363102. Its totient is φ = 318121032.

The previous prime is 636242041. The next prime is 636242071. The reversal of 636242066 is 660242636.

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., 546390625 + 89851441 = 23375^2 + 9479^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159060515 + ... + 159060518.

Almost surely, 2^636242066 is an apocalyptic number.

636242066 is a deficient number, since it is larger than the sum of its proper divisors (318121036).

636242066 is a wasteful number, since it uses less digits than its factorization.

636242066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318121035.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 636242066 is about 25223.8392398937. The cubic root of 636242066 is about 860.0838506668.

The spelling of 636242066 in words is "six hundred thirty-six million, two hundred forty-two thousand, sixty-six".