19669809377 has 2 divisors, whose sum is σ = 19669809378. Its totient is φ = 19669809376.

The previous prime is 19669809371. The next prime is 19669809389. The reversal of 19669809377 is 77390896691.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16110971041 + 3558838336 = 126929^2 + 59656^2 .

It is a cyclic number.

It is not a de Polignac number, because 19669809377 - 2²⁰ = 19668760801 is a prime.

It is not a weakly prime, because it can be changed into another prime (19669809371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9834904688 + 9834904689.

It is an arithmetic number, because the mean of its divisors is an integer number (9834904689).

Almost surely, 2^19669809377 is an apocalyptic number.

It is an amenable number.

19669809377 is a deficient number, since it is larger than the sum of its proper divisors (1).

19669809377 is an equidigital number, since it uses as much as digits as its factorization.

19669809377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30862944, while the sum is 65.

The spelling of 19669809377 in words is "nineteen billion, six hundred sixty-nine million, eight hundred nine thousand, three hundred seventy-seven".