19966304489 has 4 divisors (see below), whose sum is σ = 21017162640. Its totient is φ = 18915446340.

The previous prime is 19966304471. The next prime is 19966304537. The reversal of 19966304489 is 98440366991.

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 19966304489 - 2³² = 15671337193 is a prime.

It is a super-2 number, since 2×19966304489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19966301489) 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, 525429047 + ... + 525429084.

It is an arithmetic number, because the mean of its divisors is an integer number (5254290660).

Almost surely, 2^19966304489 is an apocalyptic number.

19966304489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19966304489 is a deficient number, since it is larger than the sum of its proper divisors (1050858151).

19966304489 is a wasteful number, since it uses less digits than its factorization.

19966304489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050858150.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 19966304489 in words is "nineteen billion, nine hundred sixty-six million, three hundred four thousand, four hundred eighty-nine".