201643016066 has 4 divisors (see below), whose sum is σ = 302464524102. Its totient is φ = 100821508032.

The previous prime is 201643016053. The next prime is 201643016089. The reversal of 201643016066 is 660610346102.

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., 184918060441 + 16724955625 = 430021^2 + 129325^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50410754015 + ... + 50410754018.

Almost surely, 2^201643016066 is an apocalyptic number.

201643016066 is a deficient number, since it is larger than the sum of its proper divisors (100821508036).

201643016066 is a wasteful number, since it uses less digits than its factorization.

201643016066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100821508035.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 201643016066 in words is "two hundred one billion, six hundred forty-three million, sixteen thousand, sixty-six".