33506665013 has 4 divisors (see below), whose sum is σ = 33547181760. Its totient is φ = 33466148268.

The previous prime is 33506664979. The next prime is 33506665021. The reversal of 33506665013 is 31056660533.

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 33506665013 - 2¹² = 33506660917 is a prime.

It is a super-2 number, since 2×33506665013² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33506665033) 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, 20257133 + ... + 20258786.

It is an arithmetic number, because the mean of its divisors is an integer number (8386795440).

Almost surely, 2^33506665013 is an apocalyptic number.

It is an amenable number.

33506665013 is a deficient number, since it is larger than the sum of its proper divisors (40516747).

33506665013 is an equidigital number, since it uses as much as digits as its factorization.

33506665013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40516746.

The product of its (nonzero) digits is 145800, while the sum is 38.

The spelling of 33506665013 in words is "thirty-three billion, five hundred six million, six hundred sixty-five thousand, thirteen".