161533111833 has 48 divisors (see below), whose sum is σ = 242901514752. Its totient is φ = 103330080000.

The previous prime is 161533111819. The next prime is 161533111837. The reversal of 161533111833 is 338111335161.

161533111833 is a `hidden beast` number, since 1 + 6 + 1 + 533 + 1 + 118 + 3 + 3 = 666.

It is not a de Polignac number, because 161533111833 - 2⁹ = 161533111321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161533111837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40170363 + ... + 40174383.

It is an arithmetic number, because the mean of its divisors is an integer number (5060448224).

Almost surely, 2^161533111833 is an apocalyptic number.

It is an amenable number.

161533111833 is a deficient number, since it is larger than the sum of its proper divisors (81368402919).

161533111833 is a wasteful number, since it uses less digits than its factorization.

161533111833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5246 (or 5243 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

Adding to 161533111833 its reverse (338111335161), we get a palindrome (499644446994).

The spelling of 161533111833 in words is "one hundred sixty-one billion, five hundred thirty-three million, one hundred eleven thousand, eight hundred thirty-three".