33211645981 has 2 divisors, whose sum is σ = 33211645982. Its totient is φ = 33211645980.

The previous prime is 33211645967. The next prime is 33211646009. The reversal of 33211645981 is 18954611233.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30469448025 + 2742197956 = 174555^2 + 52366^2 .

It is a cyclic number.

It is not a de Polignac number, because 33211645981 - 2⁷ = 33211645853 is a prime.

It is a super-2 number, since 2×33211645981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33211645081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16605822990 + 16605822991.

It is an arithmetic number, because the mean of its divisors is an integer number (16605822991).

Almost surely, 2^33211645981 is an apocalyptic number.

It is an amenable number.

33211645981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33211645981 is an equidigital number, since it uses as much as digits as its factorization.

33211645981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The spelling of 33211645981 in words is "thirty-three billion, two hundred eleven million, six hundred forty-five thousand, nine hundred eighty-one".