133680206721 has 4 divisors (see below), whose sum is σ = 178240275632. Its totient is φ = 89120137812.

The previous prime is 133680206719. The next prime is 133680206747. The reversal of 133680206721 is 127602086331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 133680206721 - 2¹ = 133680206719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 133680206721.

It is not an unprimeable number, because it can be changed into a prime (133680206701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22280034451 + ... + 22280034456.

It is an arithmetic number, because the mean of its divisors is an integer number (44560068908).

Almost surely, 2^133680206721 is an apocalyptic number.

It is an amenable number.

133680206721 is a deficient number, since it is larger than the sum of its proper divisors (44560068911).

133680206721 is an equidigital number, since it uses as much as digits as its factorization.

133680206721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44560068910.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 133680206721 in words is "one hundred thirty-three billion, six hundred eighty million, two hundred six thousand, seven hundred twenty-one".