163861989111 has 12 divisors (see below), whose sum is σ = 236693079480. Its totient is φ = 109239692400.

The previous prime is 163861989103. The next prime is 163861989131. The reversal of 163861989111 is 111989168361.

It is a happy number.

163861989111 is a `hidden beast` number, since 1 + 6 + 3 + 8 + 619 + 8 + 9 + 1 + 11 = 666.

It is not a de Polignac number, because 163861989111 - 2³ = 163861989103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163861989131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 985345 + ... + 1139573.

It is an arithmetic number, because the mean of its divisors is an integer number (19724423290).

Almost surely, 2^163861989111 is an apocalyptic number.

163861989111 is a deficient number, since it is larger than the sum of its proper divisors (72831090369).

163861989111 is a wasteful number, since it uses less digits than its factorization.

163861989111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272286 (or 272283 counting only the distinct ones).

The product of its digits is 559872, while the sum is 54.

The spelling of 163861989111 in words is "one hundred sixty-three billion, eight hundred sixty-one million, nine hundred eighty-nine thousand, one hundred eleven".