161525306133 has 12 divisors (see below), whose sum is σ = 239004925068. Its totient is φ = 105057109440.

The previous prime is 161525306101. The next prime is 161525306141. The reversal of 161525306133 is 331603525161.

161525306133 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 2 + 5 + 30 + 613 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 60212325924 + 101312980209 = 245382^2 + 318297^2 .

It is not a de Polignac number, because 161525306133 - 2⁵ = 161525306101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161525306143) 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, 218868610 + ... + 218869347.

It is an arithmetic number, because the mean of its divisors is an integer number (19917077089).

Almost surely, 2^161525306133 is an apocalyptic number.

It is an amenable number.

161525306133 is a deficient number, since it is larger than the sum of its proper divisors (77479618935).

161525306133 is a wasteful number, since it uses less digits than its factorization.

161525306133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437738004 (or 437738001 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The spelling of 161525306133 in words is "one hundred sixty-one billion, five hundred twenty-five million, three hundred six thousand, one hundred thirty-three".