33065971891 has 2 divisors, whose sum is σ = 33065971892. Its totient is φ = 33065971890.

The previous prime is 33065971889. The next prime is 33065971901. The reversal of 33065971891 is 19817956033.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 33065971891 - 2¹ = 33065971889 is a prime.

Together with 33065971889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (33065971811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16532985945 + 16532985946.

It is an arithmetic number, because the mean of its divisors is an integer number (16532985946).

Almost surely, 2^33065971891 is an apocalyptic number.

33065971891 is a deficient number, since it is larger than the sum of its proper divisors (1).

33065971891 is an equidigital number, since it uses as much as digits as its factorization.

33065971891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 33065971891 in words is "thirty-three billion, sixty-five million, nine hundred seventy-one thousand, eight hundred ninety-one".