133668818 has 4 divisors (see below), whose sum is σ = 200503230. Its totient is φ = 66834408.

The previous prime is 133668803. The next prime is 133668823. The reversal of 133668818 is 818866331.

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., 97752769 + 35916049 = 9887^2 + 5993^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33417203 + ... + 33417206.

Almost surely, 2^133668818 is an apocalyptic number.

133668818 is a deficient number, since it is larger than the sum of its proper divisors (66834412).

133668818 is an equidigital number, since it uses as much as digits as its factorization.

133668818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66834411.

The product of its digits is 165888, while the sum is 44.

The square root of 133668818 is about 11561.5231695482. The cubic root of 133668818 is about 511.3010711709.

The spelling of 133668818 in words is "one hundred thirty-three million, six hundred sixty-eight thousand, eight hundred eighteen".