133668819 has 32 divisors (see below), whose sum is σ = 211616000. Its totient is φ = 83140992.

The previous prime is 133668803. The next prime is 133668823. The reversal of 133668819 is 918866331.

It is a happy number.

It is not a de Polignac number, because 133668819 - 2⁴ = 133668803 is a prime.

It is a super-2 number, since 2×133668819² = 35734706345709522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133668839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32427 + ... + 36315.

It is an arithmetic number, because the mean of its divisors is an integer number (6613000).

Almost surely, 2^133668819 is an apocalyptic number.

133668819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

133668819 is a deficient number, since it is larger than the sum of its proper divisors (77947181).

133668819 is a wasteful number, since it uses less digits than its factorization.

133668819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984 (or 3978 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 133668819 is about 11561.5232127951. The cubic root of 133668819 is about 511.3010724460.

The spelling of 133668819 in words is "one hundred thirty-three million, six hundred sixty-eight thousand, eight hundred nineteen".