133680641868 has 24 divisors (see below), whose sum is σ = 346579442160. Its totient is φ = 44560213920.

The previous prime is 133680641867. The next prime is 133680641947. The reversal of 133680641868 is 868146086331.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (133680641867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618891753 + ... + 618891968.

It is an arithmetic number, because the mean of its divisors is an integer number (14440810090).

Almost surely, 2^133680641868 is an apocalyptic number.

133680641868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

133680641868 is an abundant number, since it is smaller than the sum of its proper divisors (212898800292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133680641868 is a wasteful number, since it uses less digits than its factorization.

133680641868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237783734 (or 1237783726 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 133680641868 in words is "one hundred thirty-three billion, six hundred eighty million, six hundred forty-one thousand, eight hundred sixty-eight".