12537161309 has 12 divisors (see below), whose sum is σ = 13467690900. Its totient is φ = 11667076608.

The previous prime is 12537161293. The next prime is 12537161321. The reversal of 12537161309 is 90316173521.

It can be written as a sum of positive squares in 6 ways, for example, as 2889600025 + 9647561284 = 53755^2 + 98222^2 .

It is not a de Polignac number, because 12537161309 - 2⁴ = 12537161293 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 (12537161509) 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, 217994 + ... + 269435.

It is an arithmetic number, because the mean of its divisors is an integer number (1122307575).

Almost surely, 2^12537161309 is an apocalyptic number.

It is an amenable number.

12537161309 is a deficient number, since it is larger than the sum of its proper divisors (930529591).

12537161309 is an equidigital number, since it uses as much as digits as its factorization.

12537161309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487552 (or 487535 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The spelling of 12537161309 in words is "twelve billion, five hundred thirty-seven million, one hundred sixty-one thousand, three hundred nine".