12158155973 has 2 divisors, whose sum is σ = 12158155974. Its totient is φ = 12158155972.

The previous prime is 12158155967. The next prime is 12158155987. The reversal of 12158155973 is 37955185121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12156826564 + 1329409 = 110258^2 + 1153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12158155973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12158155903) 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 as a sum of consecutive naturals, namely, 6079077986 + 6079077987.

It is an arithmetic number, because the mean of its divisors is an integer number (6079077987).

Almost surely, 2^12158155973 is an apocalyptic number.

It is an amenable number.

12158155973 is a deficient number, since it is larger than the sum of its proper divisors (1).

12158155973 is an equidigital number, since it uses as much as digits as its factorization.

12158155973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 47.

The spelling of 12158155973 in words is "twelve billion, one hundred fifty-eight million, one hundred fifty-five thousand, nine hundred seventy-three".