33668067781 has 4 divisors (see below), whose sum is σ = 33925076064. Its totient is φ = 33411059500.

The previous prime is 33668067743. The next prime is 33668067791. The reversal of 33668067781 is 18776086633.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33668067781 - 2¹⁵ = 33668035013 is a prime.

It is a super-2 number, since 2×33668067781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33668067701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128503945 + ... + 128504206.

It is an arithmetic number, because the mean of its divisors is an integer number (8481269016).

Almost surely, 2^33668067781 is an apocalyptic number.

It is an amenable number.

33668067781 is a deficient number, since it is larger than the sum of its proper divisors (257008283).

33668067781 is a wasteful number, since it uses less digits than its factorization.

33668067781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257008282.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 33668067781 in words is "thirty-three billion, six hundred sixty-eight million, sixty-seven thousand, seven hundred eighty-one".