19668631966 has 8 divisors (see below), whose sum is σ = 29531511504. Its totient is φ = 9824794800.

The previous prime is 19668631963. The next prime is 19668632023. The reversal of 19668631966 is 66913686691.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19668631963) 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, 4758010 + ... + 4762141.

It is an arithmetic number, because the mean of its divisors is an integer number (3691438938).

Almost surely, 2^19668631966 is an apocalyptic number.

19668631966 is a deficient number, since it is larger than the sum of its proper divisors (9862879538).

19668631966 is a wasteful number, since it uses less digits than its factorization.

19668631966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9521186.

The product of its digits is 15116544, while the sum is 61.

The spelling of 19668631966 in words is "nineteen billion, six hundred sixty-eight million, six hundred thirty-one thousand, nine hundred sixty-six".