33406306561 has 4 divisors (see below), whose sum is σ = 33750701572. Its totient is φ = 33061911552.

The previous prime is 33406306547. The next prime is 33406306567. The reversal of 33406306561 is 16560360433.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16758855936 + 16647450625 = 129456^2 + 129025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33406306561 is a prime.

It is a super-2 number, since 2×33406306561² (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 33406306561.

It is not an unprimeable number, because it can be changed into a prime (33406306567) 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, 172197360 + ... + 172197553.

It is an arithmetic number, because the mean of its divisors is an integer number (8437675393).

Almost surely, 2^33406306561 is an apocalyptic number.

It is an amenable number.

33406306561 is a deficient number, since it is larger than the sum of its proper divisors (344395011).

33406306561 is an equidigital number, since it uses as much as digits as its factorization.

33406306561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344395010.

The product of its (nonzero) digits is 116640, while the sum is 37.

Adding to 33406306561 its reverse (16560360433), we get a palindrome (49966666994).

The spelling of 33406306561 in words is "thirty-three billion, four hundred six million, three hundred six thousand, five hundred sixty-one".