161161551106533 has 20 divisors (see below), whose sum is σ = 242504783325420. Its totient is φ = 106656792939072.

The previous prime is 161161551106531. The next prime is 161161551106553. The reversal of 161161551106533 is 335601155161161.

161161551106533 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 6 + 1 + 5 + 5 + 1 + 106 + 533 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 133293097739169 + 27868453367364 = 11545263^2 + 5279058^2 .

It is not a de Polignac number, because 161161551106533 - 2¹ = 161161551106531 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161161551106531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7261480798 + ... + 7261502991.

It is an arithmetic number, because the mean of its divisors is an integer number (12125239166271).

Almost surely, 2^{161161551106533} is an apocalyptic number.

It is an amenable number.

161161551106533 is a deficient number, since it is larger than the sum of its proper divisors (81343232218887).

161161551106533 is a wasteful number, since it uses less digits than its factorization.

161161551106533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14522983938 (or 14522983929 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 161161551106533 in words is "one hundred sixty-one trillion, one hundred sixty-one billion, five hundred fifty-one million, one hundred six thousand, five hundred thirty-three".