19866128029 has 4 divisors (see below), whose sum is σ = 21672139680. Its totient is φ = 18060116380.

The previous prime is 19866128027. The next prime is 19866128057. The reversal of 19866128029 is 92082166891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19866128029 - 2¹ = 19866128027 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19866128027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903005809 + ... + 903005830.

It is an arithmetic number, because the mean of its divisors is an integer number (5418034920).

Almost surely, 2^19866128029 is an apocalyptic number.

It is an amenable number.

19866128029 is a deficient number, since it is larger than the sum of its proper divisors (1806011651).

19866128029 is a wasteful number, since it uses less digits than its factorization.

19866128029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806011650.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 19866128029 in words is "nineteen billion, eight hundred sixty-six million, one hundred twenty-eight thousand, twenty-nine".