33555545661 has 16 divisors (see below), whose sum is σ = 49943139840. Its totient is φ = 19863747120.

The previous prime is 33555545633. The next prime is 33555545713. The reversal of 33555545661 is 16654555533.

It is not a de Polignac number, because 33555545661 - 2¹⁰ = 33555544637 is a prime.

It is a super-2 number, since 2×33555545661² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33555545661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33555545161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11822241 + ... + 11825078.

It is an arithmetic number, because the mean of its divisors is an integer number (3121446240).

Almost surely, 2^33555545661 is an apocalyptic number.

It is an amenable number.

33555545661 is a deficient number, since it is larger than the sum of its proper divisors (16387594179).

33555545661 is a wasteful number, since it uses less digits than its factorization.

33555545661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23647376.

The product of its digits is 4050000, while the sum is 48.

The spelling of 33555545661 in words is "thirty-three billion, five hundred fifty-five million, five hundred forty-five thousand, six hundred sixty-one".