20147965666 has 8 divisors (see below), whose sum is σ = 30355085520. Its totient is φ = 10029603828.

The previous prime is 20147965639. The next prime is 20147965699. The reversal of 20147965666 is 66656974102.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22188936 + ... + 22189843.

It is an arithmetic number, because the mean of its divisors is an integer number (3794385690).

Almost surely, 2^20147965666 is an apocalyptic number.

20147965666 is a deficient number, since it is larger than the sum of its proper divisors (10207119854).

20147965666 is a wasteful number, since it uses less digits than its factorization.

20147965666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44379008.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 20147965666 in words is "twenty billion, one hundred forty-seven million, nine hundred sixty-five thousand, six hundred sixty-six".