19916877229 has 2 divisors, whose sum is σ = 19916877230. Its totient is φ = 19916877228.

The previous prime is 19916877203. The next prime is 19916877247. The reversal of 19916877229 is 92277861991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15743975625 + 4172901604 = 125475^2 + 64598^2 .

It is a cyclic number.

It is not a de Polignac number, because 19916877229 - 2⁹ = 19916876717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19913877229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9958438614 + 9958438615.

It is an arithmetic number, because the mean of its divisors is an integer number (9958438615).

Almost surely, 2^19916877229 is an apocalyptic number.

It is an amenable number.

19916877229 is a deficient number, since it is larger than the sum of its proper divisors (1).

19916877229 is an equidigital number, since it uses as much as digits as its factorization.

19916877229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 61.

The spelling of 19916877229 in words is "nineteen billion, nine hundred sixteen million, eight hundred seventy-seven thousand, two hundred twenty-nine".