163886656639 has 16 divisors (see below), whose sum is σ = 175760737920. Its totient is φ = 152285991936.

The previous prime is 163886656631. The next prime is 163886656651. The reversal of 163886656639 is 936656688361.

It is not a de Polignac number, because 163886656639 - 2³ = 163886656631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163886656631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8371887 + ... + 8391439.

It is an arithmetic number, because the mean of its divisors is an integer number (10985046120).

Almost surely, 2^163886656639 is an apocalyptic number.

163886656639 is a deficient number, since it is larger than the sum of its proper divisors (11874081281).

163886656639 is an frugal number, since it uses more digits than its factorization.

163886656639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19807 (or 19649 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 67.

The spelling of 163886656639 in words is "one hundred sixty-three billion, eight hundred eighty-six million, six hundred fifty-six thousand, six hundred thirty-nine".