236161118581 has 2 divisors, whose sum is σ = 236161118582. Its totient is φ = 236161118580.

The previous prime is 236161118561. The next prime is 236161118593. The reversal of 236161118581 is 185811161632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119070544356 + 117090574225 = 345066^2 + 342185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-236161118581 is a prime.

It is a super-2 number, since 2×236161118581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (236161118561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118080559290 + 118080559291.

It is an arithmetic number, because the mean of its divisors is an integer number (118080559291).

Almost surely, 2^236161118581 is an apocalyptic number.

It is an amenable number.

236161118581 is a deficient number, since it is larger than the sum of its proper divisors (1).

236161118581 is an equidigital number, since it uses as much as digits as its factorization.

236161118581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 43.

The spelling of 236161118581 in words is "two hundred thirty-six billion, one hundred sixty-one million, one hundred eighteen thousand, five hundred eighty-one".