133329791918 has 4 divisors (see below), whose sum is σ = 199994687880. Its totient is φ = 66664895958.

The previous prime is 133329791843. The next prime is 133329791951. The reversal of 133329791918 is 819197923331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 819197923331 = 2549 ⋅321380119.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332447978 + ... + 33332447981.

It is an arithmetic number, because the mean of its divisors is an integer number (49998671970).

Almost surely, 2^133329791918 is an apocalyptic number.

133329791918 is a deficient number, since it is larger than the sum of its proper divisors (66664895962).

133329791918 is an equidigital number, since it uses as much as digits as its factorization.

133329791918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66664895961.

The product of its digits is 2204496, while the sum is 56.

The spelling of 133329791918 in words is "one hundred thirty-three billion, three hundred twenty-nine million, seven hundred ninety-one thousand, nine hundred eighteen".