19866032869 has 2 divisors, whose sum is σ = 19866032870. Its totient is φ = 19866032868.

The previous prime is 19866032861. The next prime is 19866032881. The reversal of 19866032869 is 96823066891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15531390625 + 4334642244 = 124625^2 + 65838^2 .

It is a cyclic number.

It is not a de Polignac number, because 19866032869 - 2³ = 19866032861 is a prime.

It is a super-2 number, since 2×19866032869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19866032861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9933016434 + 9933016435.

It is an arithmetic number, because the mean of its divisors is an integer number (9933016435).

Almost surely, 2^19866032869 is an apocalyptic number.

It is an amenable number.

19866032869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19866032869 is an equidigital number, since it uses as much as digits as its factorization.

19866032869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 58.

The spelling of 19866032869 in words is "nineteen billion, eight hundred sixty-six million, thirty-two thousand, eight hundred sixty-nine".