33685216681 has 4 divisors (see below), whose sum is σ = 33861579264. Its totient is φ = 33508854100.

The previous prime is 33685216637. The next prime is 33685216693. The reversal of 33685216681 is 18661258633.

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 a cyclic number.

It is not a de Polignac number, because 33685216681 - 2⁷ = 33685216553 is a prime.

It is a super-2 number, since 2×33685216681² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33685216181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88181005 + ... + 88181386.

It is an arithmetic number, because the mean of its divisors is an integer number (8465394816).

Almost surely, 2^33685216681 is an apocalyptic number.

It is an amenable number.

33685216681 is a deficient number, since it is larger than the sum of its proper divisors (176362583).

33685216681 is a wasteful number, since it uses less digits than its factorization.

33685216681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176362582.

The product of its digits is 1244160, while the sum is 49.

The spelling of 33685216681 in words is "thirty-three billion, six hundred eighty-five million, two hundred sixteen thousand, six hundred eighty-one".