33778073809 has 4 divisors (see below), whose sum is σ = 33929545216. Its totient is φ = 33626602404.

The previous prime is 33778073761. The next prime is 33778073837. The reversal of 33778073809 is 90837087733.

It is a happy number.

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 33778073809 - 2³¹ = 31630590161 is a prime.

It is a super-2 number, since 2×33778073809² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33778073809.

It is not an unprimeable number, because it can be changed into a prime (33778073909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75735369 + ... + 75735814.

It is an arithmetic number, because the mean of its divisors is an integer number (8482386304).

Almost surely, 2^33778073809 is an apocalyptic number.

It is an amenable number.

33778073809 is a deficient number, since it is larger than the sum of its proper divisors (151471407).

33778073809 is a wasteful number, since it uses less digits than its factorization.

33778073809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151471406.

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 33778073809 in words is "thirty-three billion, seven hundred seventy-eight million, seventy-three thousand, eight hundred nine".