33664780643 has 4 divisors (see below), whose sum is σ = 36254379168. Its totient is φ = 31075182120.

The previous prime is 33664780627. The next prime is 33664780649. The reversal of 33664780643 is 34608746633.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 33664780643 - 2⁴ = 33664780627 is a prime.

It is a super-2 number, since 2×33664780643² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33664780591 and 33664780600.

It is not an unprimeable number, because it can be changed into a prime (33664780649) 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, 1294799243 + ... + 1294799268.

It is an arithmetic number, because the mean of its divisors is an integer number (9063594792).

Almost surely, 2^33664780643 is an apocalyptic number.

33664780643 is a deficient number, since it is larger than the sum of its proper divisors (2589598525).

33664780643 is a wasteful number, since it uses less digits than its factorization.

33664780643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589598524.

The product of its (nonzero) digits is 5225472, while the sum is 50.

The spelling of 33664780643 in words is "thirty-three billion, six hundred sixty-four million, seven hundred eighty thousand, six hundred forty-three".