12161431632 has 40 divisors (see below), whose sum is σ = 35905180096. Its totient is φ = 3474694656.

The previous prime is 12161431609. The next prime is 12161431649. The reversal of 12161431632 is 23613416121.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 12161431632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18097033 + ... + 18097704.

Almost surely, 2^12161431632 is an apocalyptic number.

12161431632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12161431632 is an abundant number, since it is smaller than the sum of its proper divisors (23743748464).

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

12161431632 is a wasteful number, since it uses less digits than its factorization.

12161431632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36194755 (or 36194749 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

Adding to 12161431632 its reverse (23613416121), we get a palindrome (35774847753).

The spelling of 12161431632 in words is "twelve billion, one hundred sixty-one million, four hundred thirty-one thousand, six hundred thirty-two".