12491764997 has 2 divisors, whose sum is σ = 12491764998. Its totient is φ = 12491764996.

The previous prime is 12491764981. The next prime is 12491765021. The reversal of 12491764997 is 79946719421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9970821316 + 2520943681 = 99854^2 + 50209^2 .

It is a cyclic number.

It is not a de Polignac number, because 12491764997 - 2⁴ = 12491764981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12491764907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6245882498 + 6245882499.

It is an arithmetic number, because the mean of its divisors is an integer number (6245882499).

Almost surely, 2^12491764997 is an apocalyptic number.

It is an amenable number.

12491764997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491764997 is an equidigital number, since it uses as much as digits as its factorization.

12491764997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 59.

The spelling of 12491764997 in words is "twelve billion, four hundred ninety-one million, seven hundred sixty-four thousand, nine hundred ninety-seven".