33168199681 has 2 divisors, whose sum is σ = 33168199682. Its totient is φ = 33168199680.

The previous prime is 33168199663. The next prime is 33168199693. The reversal of 33168199681 is 18699186133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33160410000 + 7789681 = 182100^2 + 2791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33168199681 is a prime.

It is a super-2 number, since 2×33168199681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33168199381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16584099840 + 16584099841.

It is an arithmetic number, because the mean of its divisors is an integer number (16584099841).

Almost surely, 2^33168199681 is an apocalyptic number.

It is an amenable number.

33168199681 is a deficient number, since it is larger than the sum of its proper divisors (1).

33168199681 is an equidigital number, since it uses as much as digits as its factorization.

33168199681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 55.

The spelling of 33168199681 in words is "thirty-three billion, one hundred sixty-eight million, one hundred ninety-nine thousand, six hundred eighty-one".