12647742491 has 2 divisors, whose sum is σ = 12647742492. Its totient is φ = 12647742490.

The previous prime is 12647742461. The next prime is 12647742557. The reversal of 12647742491 is 19424774621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12647742491 - 2⁶ = 12647742427 is a prime.

It is not a weakly prime, because it can be changed into another prime (12647742431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6323871245 + 6323871246.

It is an arithmetic number, because the mean of its divisors is an integer number (6323871246).

Almost surely, 2^12647742491 is an apocalyptic number.

12647742491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12647742491 is an equidigital number, since it uses as much as digits as its factorization.

12647742491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The spelling of 12647742491 in words is "twelve billion, six hundred forty-seven million, seven hundred forty-two thousand, four hundred ninety-one".