133531213666161 has 16 divisors (see below), whose sum is σ = 185783961052800. Its totient is φ = 85149696149760.

The previous prime is 133531213666139. The next prime is 133531213666163. The reversal of 133531213666161 is 161666312135331.

It is not a de Polignac number, because 133531213666161 - 2¹¹ = 133531213664113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133531213666161.

It is not an unprimeable number, because it can be changed into a prime (133531213666163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1981791 + ... + 16461771.

It is an arithmetic number, because the mean of its divisors is an integer number (11611497565800).

Almost surely, 2^{133531213666161} is an apocalyptic number.

It is an amenable number.

133531213666161 is a deficient number, since it is larger than the sum of its proper divisors (52252747386639).

133531213666161 is a wasteful number, since it uses less digits than its factorization.

133531213666161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14613656.

The product of its digits is 1049760, while the sum is 48.

The spelling of 133531213666161 in words is "one hundred thirty-three trillion, five hundred thirty-one billion, two hundred thirteen million, six hundred sixty-six thousand, one hundred sixty-one".