19966148687 has 2 divisors, whose sum is σ = 19966148688. Its totient is φ = 19966148686.

The previous prime is 19966148633. The next prime is 19966148737. The reversal of 19966148687 is 78684166991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19966148687 - 2¹² = 19966144591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19966142687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9983074343 + 9983074344.

It is an arithmetic number, because the mean of its divisors is an integer number (9983074344).

Almost surely, 2^19966148687 is an apocalyptic number.

19966148687 is a deficient number, since it is larger than the sum of its proper divisors (1).

19966148687 is an equidigital number, since it uses as much as digits as its factorization.

19966148687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 65.

The spelling of 19966148687 in words is "nineteen billion, nine hundred sixty-six million, one hundred forty-eight thousand, six hundred eighty-seven".