33985285561 has 4 divisors (see below), whose sum is σ = 34450837492. Its totient is φ = 33519733632.

The previous prime is 33985285517. The next prime is 33985285567. The reversal of 33985285561 is 16558258933.

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 13466442025 + 20518843536 = 116045^2 + 143244^2 .

It is a cyclic number.

It is not a de Polignac number, because 33985285561 - 2¹¹ = 33985283513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33985285567) 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, 232775856 + ... + 232776001.

It is an arithmetic number, because the mean of its divisors is an integer number (8612709373).

Almost surely, 2^33985285561 is an apocalyptic number.

It is an amenable number.

33985285561 is a deficient number, since it is larger than the sum of its proper divisors (465551931).

33985285561 is an equidigital number, since it uses as much as digits as its factorization.

33985285561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465551930.

The product of its digits is 7776000, while the sum is 55.

The spelling of 33985285561 in words is "thirty-three billion, nine hundred eighty-five million, two hundred eighty-five thousand, five hundred sixty-one".