12115581953 has 2 divisors, whose sum is σ = 12115581954. Its totient is φ = 12115581952.

The previous prime is 12115581943. The next prime is 12115581967. The reversal of 12115581953 is 35918551121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6768023824 + 5347558129 = 82268^2 + 73127^2 .

It is a cyclic number.

It is not a de Polignac number, because 12115581953 - 2⁶ = 12115581889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12115581953.

It is not a weakly prime, because it can be changed into another prime (12115581943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6057790976 + 6057790977.

It is an arithmetic number, because the mean of its divisors is an integer number (6057790977).

Almost surely, 2^12115581953 is an apocalyptic number.

It is an amenable number.

12115581953 is a deficient number, since it is larger than the sum of its proper divisors (1).

12115581953 is an equidigital number, since it uses as much as digits as its factorization.

12115581953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 41.

The spelling of 12115581953 in words is "twelve billion, one hundred fifteen million, five hundred eighty-one thousand, nine hundred fifty-three".