33404344381 has 2 divisors, whose sum is σ = 33404344382. Its totient is φ = 33404344380.

The previous prime is 33404344349. The next prime is 33404344453. The reversal of 33404344381 is 18344340433.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25038315225 + 8366029156 = 158235^2 + 91466^2 .

It is a cyclic number.

It is not a de Polignac number, because 33404344381 - 2⁵ = 33404344349 is a prime.

It is a super-2 number, since 2×33404344381² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33404344381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33494344381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16702172190 + 16702172191.

It is an arithmetic number, because the mean of its divisors is an integer number (16702172191).

Almost surely, 2^33404344381 is an apocalyptic number.

It is an amenable number.

33404344381 is a deficient number, since it is larger than the sum of its proper divisors (1).

33404344381 is an equidigital number, since it uses as much as digits as its factorization.

33404344381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 37.

The spelling of 33404344381 in words is "thirty-three billion, four hundred four million, three hundred forty-four thousand, three hundred eighty-one".