19766415281 has 2 divisors, whose sum is σ = 19766415282. Its totient is φ = 19766415280.

The previous prime is 19766415259. The next prime is 19766415301. The reversal of 19766415281 is 18251466791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19744746256 + 21669025 = 140516^2 + 4655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19766415281 is a prime.

It is a super-2 number, since 2×19766415281² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19766415481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9883207640 + 9883207641.

It is an arithmetic number, because the mean of its divisors is an integer number (9883207641).

Almost surely, 2^19766415281 is an apocalyptic number.

It is an amenable number.

19766415281 is a deficient number, since it is larger than the sum of its proper divisors (1).

19766415281 is an equidigital number, since it uses as much as digits as its factorization.

19766415281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The spelling of 19766415281 in words is "nineteen billion, seven hundred sixty-six million, four hundred fifteen thousand, two hundred eighty-one".