12642291197 has 2 divisors, whose sum is σ = 12642291198. Its totient is φ = 12642291196.

The previous prime is 12642291187. The next prime is 12642291229. The reversal of 12642291197 is 79119224621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7826763961 + 4815527236 = 88469^2 + 69394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12642291197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642291127) 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, 6321145598 + 6321145599.

It is an arithmetic number, because the mean of its divisors is an integer number (6321145599).

Almost surely, 2^12642291197 is an apocalyptic number.

It is an amenable number.

12642291197 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642291197 is an equidigital number, since it uses as much as digits as its factorization.

12642291197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The spelling of 12642291197 in words is "twelve billion, six hundred forty-two million, two hundred ninety-one thousand, one hundred ninety-seven".