12156101605 has 4 divisors (see below), whose sum is σ = 14587321932. Its totient is φ = 9724881280.

The previous prime is 12156101569. The next prime is 12156101609. The reversal of 12156101605 is 50610165121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50610165121 = 4909 ⋅10309669.

It can be written as a sum of positive squares in 2 ways, for example, as 3356348356 + 8799753249 = 57934^2 + 93807^2 .

It is not a de Polignac number, because 12156101605 - 2⁹ = 12156101093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156101609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215610156 + ... + 1215610165.

It is an arithmetic number, because the mean of its divisors is an integer number (3646830483).

Almost surely, 2^12156101605 is an apocalyptic number.

It is an amenable number.

12156101605 is a deficient number, since it is larger than the sum of its proper divisors (2431220327).

12156101605 is an equidigital number, since it uses as much as digits as its factorization.

12156101605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431220326.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 12156101605 its reverse (50610165121), we get a palindrome (62766266726).

The spelling of 12156101605 in words is "twelve billion, one hundred fifty-six million, one hundred one thousand, six hundred five".