12144252561 has 12 divisors (see below), whose sum is σ = 18835983792. Its totient is φ = 6939572808.

The previous prime is 12144252529. The next prime is 12144252611. The reversal of 12144252561 is 16525244121.

It is a happy number.

It is not a de Polignac number, because 12144252561 - 2⁵ = 12144252529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12144252761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41306835 + ... + 41307128.

It is an arithmetic number, because the mean of its divisors is an integer number (1569665316).

Almost surely, 2^12144252561 is an apocalyptic number.

It is an amenable number.

12144252561 is a deficient number, since it is larger than the sum of its proper divisors (6691731231).

12144252561 is an equidigital number, since it uses as much as digits as its factorization.

12144252561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82613980 (or 82613973 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

Adding to 12144252561 its reverse (16525244121), we get a palindrome (28669496682).

The spelling of 12144252561 in words is "twelve billion, one hundred forty-four million, two hundred fifty-two thousand, five hundred sixty-one".