187385921808 has 20 divisors (see below), whose sum is σ = 484080298128. Its totient is φ = 62461973920.

The previous prime is 187385921791. The next prime is 187385921809. The reversal of 187385921808 is 808129583781.

It is a super-2 number, since 2×187385921808² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (187385921809) 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, 1951936638 + ... + 1951936733.

Almost surely, 2^187385921808 is an apocalyptic number.

It is an amenable number.

187385921808 is an abundant number, since it is smaller than the sum of its proper divisors (296694376320).

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

187385921808 is a wasteful number, since it uses less digits than its factorization.

187385921808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903873382 (or 3903873376 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 60.

The spelling of 187385921808 in words is "one hundred eighty-seven billion, three hundred eighty-five million, nine hundred twenty-one thousand, eight hundred eight".