33990168893 has 2 divisors, whose sum is σ = 33990168894. Its totient is φ = 33990168892.

The previous prime is 33990168761. The next prime is 33990168977. The reversal of 33990168893 is 39886109933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31188266404 + 2801902489 = 176602^2 + 52933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33990168893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33990168193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16995084446 + 16995084447.

It is an arithmetic number, because the mean of its divisors is an integer number (16995084447).

Almost surely, 2^33990168893 is an apocalyptic number.

It is an amenable number.

33990168893 is a deficient number, since it is larger than the sum of its proper divisors (1).

33990168893 is an equidigital number, since it uses as much as digits as its factorization.

33990168893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 59.

The spelling of 33990168893 in words is "thirty-three billion, nine hundred ninety million, one hundred sixty-eight thousand, eight hundred ninety-three".