189863794864 has 20 divisors (see below), whose sum is σ = 379727590720. Its totient is φ = 91869577920.

The previous prime is 189863794843. The next prime is 189863794867. The reversal of 189863794864 is 468497368981.

189863794864 is an admirable number.

It is a super-3 number, since 3×189863794864³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (189863794867) 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, 191394459 + ... + 191395450.

It is an arithmetic number, because the mean of its divisors is an integer number (18986379536).

Almost surely, 2^189863794864 is an apocalyptic number.

It is an amenable number.

189863794864 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

189863794864 is a wasteful number, since it uses less digits than its factorization.

189863794864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382789948 (or 382789942 counting only the distinct ones).

The product of its digits is 501645312, while the sum is 73.

The spelling of 189863794864 in words is "one hundred eighty-nine billion, eight hundred sixty-three million, seven hundred ninety-four thousand, eight hundred sixty-four".