231665566132 has 96 divisors (see below), whose sum is σ = 548620369920. Its totient is φ = 82660072320.

The previous prime is 231665566109. The next prime is 231665566151.

231665566132 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280719 + ... + 736297.

It is an arithmetic number, because the mean of its divisors is an integer number (5714795520).

Almost surely, 2^231665566132 is an apocalyptic number.

231665566132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231665566132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274310184960).

231665566132 is an abundant number, since it is smaller than the sum of its proper divisors (316954803788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231665566132 is a wasteful number, since it uses less digits than its factorization.

231665566132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455741 (or 455739 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 46.

It can be divided in two parts, 231665 and 566132, that added together give a palindrome (797797).

The spelling of 231665566132 in words is "two hundred thirty-one billion, six hundred sixty-five million, five hundred sixty-six thousand, one hundred thirty-two".