235613985581 has 16 divisors (see below), whose sum is σ = 259234370304. Its totient is φ = 212782261824.

The previous prime is 235613985469. The next prime is 235613985601. The reversal of 235613985581 is 185589316532.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-235613985581 is a prime.

It is a super-2 number, since 2×235613985581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235613984581) 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, 1582751 + ... + 1725203.

It is an arithmetic number, because the mean of its divisors is an integer number (16202148144).

Almost surely, 2^235613985581 is an apocalyptic number.

It is an amenable number.

235613985581 is a deficient number, since it is larger than the sum of its proper divisors (23620384723).

235613985581 is a wasteful number, since it uses less digits than its factorization.

235613985581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145220.

The product of its digits is 7776000, while the sum is 56.

The spelling of 235613985581 in words is "two hundred thirty-five billion, six hundred thirteen million, nine hundred eighty-five thousand, five hundred eighty-one".