12161537481 has 4 divisors (see below), whose sum is σ = 16215383312. Its totient is φ = 8107691652.

The previous prime is 12161537473. The next prime is 12161537483. The reversal of 12161537481 is 18473516121.

12161537481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12161537481 - 2³ = 12161537473 is a prime.

It is a super-2 number, since 2×12161537481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12161537483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026922911 + ... + 2026922916.

It is an arithmetic number, because the mean of its divisors is an integer number (4053845828).

Almost surely, 2^12161537481 is an apocalyptic number.

It is an amenable number.

12161537481 is a deficient number, since it is larger than the sum of its proper divisors (4053845831).

12161537481 is an equidigital number, since it uses as much as digits as its factorization.

12161537481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053845830.

The product of its digits is 40320, while the sum is 39.

The spelling of 12161537481 in words is "twelve billion, one hundred sixty-one million, five hundred thirty-seven thousand, four hundred eighty-one".