19809171066 has 8 divisors (see below), whose sum is σ = 39618342144. Its totient is φ = 6603057020.

The previous prime is 19809171007. The next prime is 19809171113. The reversal of 19809171066 is 66017190891.

It is a sphenic number, since it is the product of 3 distinct primes.

19809171066 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650764250 + ... + 1650764261.

It is an arithmetic number, because the mean of its divisors is an integer number (4952292768).

Almost surely, 2^19809171066 is an apocalyptic number.

19809171066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19809171066 is a wasteful number, since it uses less digits than its factorization.

19809171066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301528516.

The product of its (nonzero) digits is 163296, while the sum is 48.

The spelling of 19809171066 in words is "nineteen billion, eight hundred nine million, one hundred seventy-one thousand, sixty-six".