19166532985 has 8 divisors (see below), whose sum is σ = 23621457096. Its totient is φ = 14918814720.

The previous prime is 19166532971. The next prime is 19166532991. The reversal of 19166532985 is 58923566191.

It can be written as a sum of positive squares in 4 ways, for example, as 2408453776 + 16758079209 = 49076^2 + 129453^2 .

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

It is not a de Polignac number, because 19166532985 - 2¹¹ = 19166530937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51801256 + ... + 51801625.

It is an arithmetic number, because the mean of its divisors is an integer number (2952682137).

Almost surely, 2^19166532985 is an apocalyptic number.

It is an amenable number.

19166532985 is a deficient number, since it is larger than the sum of its proper divisors (4454924111).

19166532985 is a wasteful number, since it uses less digits than its factorization.

19166532985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103602923.

The product of its digits is 3499200, while the sum is 55.

The spelling of 19166532985 in words is "nineteen billion, one hundred sixty-six million, five hundred thirty-two thousand, nine hundred eighty-five".