33857965561 has 12 divisors (see below), whose sum is σ = 41702609268. Its totient is φ = 27313988352.

The previous prime is 33857965549. The next prime is 33857965577. The reversal of 33857965561 is 16556975833.

It can be written as a sum of positive squares in 2 ways, for example, as 13731152400 + 20126813161 = 117180^2 + 141869^2 .

It is not a de Polignac number, because 33857965561 - 2¹⁵ = 33857932793 is a prime.

It is a super-2 number, since 2×33857965561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33857965496 and 33857965505.

It is not an unprimeable number, because it can be changed into a prime (33857965501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20322076 + ... + 20323741.

It is an arithmetic number, because the mean of its divisors is an integer number (3475217439).

Almost surely, 2^33857965561 is an apocalyptic number.

It is an amenable number.

33857965561 is a deficient number, since it is larger than the sum of its proper divisors (7844643707).

33857965561 is a wasteful number, since it uses less digits than its factorization.

33857965561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40645848 (or 40645841 counting only the distinct ones).

The product of its digits is 20412000, while the sum is 58.

The spelling of 33857965561 in words is "thirty-three billion, eight hundred fifty-seven million, nine hundred sixty-five thousand, five hundred sixty-one".