133420836818 has 4 divisors (see below), whose sum is σ = 200131255230. Its totient is φ = 66710418408.

The previous prime is 133420836817. The next prime is 133420836839. The reversal of 133420836818 is 818638024331.

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., 82319069569 + 51101767249 = 286913^2 + 226057^2 .

It is a super-2 number, since 2×133420836818² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133420836817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33355209203 + ... + 33355209206.

Almost surely, 2^133420836818 is an apocalyptic number.

133420836818 is a deficient number, since it is larger than the sum of its proper divisors (66710418412).

133420836818 is an equidigital number, since it uses as much as digits as its factorization.

133420836818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66710418411.

The product of its (nonzero) digits is 663552, while the sum is 47.

The spelling of 133420836818 in words is "one hundred thirty-three billion, four hundred twenty million, eight hundred thirty-six thousand, eight hundred eighteen".