33881903308681 has 2 divisors, whose sum is σ = 33881903308682. Its totient is φ = 33881903308680.

The previous prime is 33881903308679. The next prime is 33881903308723. The reversal of 33881903308681 is 18680330918833.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29893654665081 + 3988248643600 = 5467509^2 + 1997060^2 .

It is an emirp because it is prime and its reverse (18680330918833) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33881903308681 - 2¹ = 33881903308679 is a prime.

It is a super-2 number, since 2×33881903308681² (a number of 28 digits) contains 22 as substring.

Together with 33881903308679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (33881903308621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16940951654340 + 16940951654341.

It is an arithmetic number, because the mean of its divisors is an integer number (16940951654341).

Almost surely, 2^{33881903308681} is an apocalyptic number.

It is an amenable number.

33881903308681 is a deficient number, since it is larger than the sum of its proper divisors (1).

33881903308681 is an equidigital number, since it uses as much as digits as its factorization.

33881903308681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17915904, while the sum is 61.

The spelling of 33881903308681 in words is "thirty-three trillion, eight hundred eighty-one billion, nine hundred three million, three hundred eight thousand, six hundred eighty-one".