19722639066 has 16 divisors (see below), whose sum is σ = 42479530464. Its totient is φ = 6068504304.

The previous prime is 19722639047. The next prime is 19722639067. The reversal of 19722639066 is 66093622791.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19722639067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126427096 + ... + 126427251.

It is an arithmetic number, because the mean of its divisors is an integer number (2654970654).

Almost surely, 2^19722639066 is an apocalyptic number.

19722639066 is an abundant number, since it is smaller than the sum of its proper divisors (22756891398).

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

19722639066 is a wasteful number, since it uses less digits than its factorization.

19722639066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252854365.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The spelling of 19722639066 in words is "nineteen billion, seven hundred twenty-two million, six hundred thirty-nine thousand, sixty-six".