33440134781 has 2 divisors, whose sum is σ = 33440134782. Its totient is φ = 33440134780.

The previous prime is 33440134757. The next prime is 33440134787. The reversal of 33440134781 is 18743104433.

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., 25747090681 + 7693044100 = 160459^2 + 87710^2 .

It is a cyclic number.

It is not a de Polignac number, because 33440134781 - 2¹⁸ = 33439872637 is a prime.

It is a super-2 number, since 2×33440134781² (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 (33440134787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16720067390 + 16720067391.

It is an arithmetic number, because the mean of its divisors is an integer number (16720067391).

Almost surely, 2^33440134781 is an apocalyptic number.

It is an amenable number.

33440134781 is a deficient number, since it is larger than the sum of its proper divisors (1).

33440134781 is an equidigital number, since it uses as much as digits as its factorization.

33440134781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 33440134781 in words is "thirty-three billion, four hundred forty million, one hundred thirty-four thousand, seven hundred eighty-one".