16891165890 has 48 divisors (see below), whose sum is σ = 43934844096. Its totient is φ = 4502484000.

The previous prime is 16891165867. The next prime is 16891165901. The reversal of 16891165890 is 9856119861.

It is a super-2 number, since 2×16891165890² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192805 + ... + 266375.

It is an arithmetic number, because the mean of its divisors is an integer number (915309252).

Almost surely, 2^16891165890 is an apocalyptic number.

16891165890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16891165890 is an abundant number, since it is smaller than the sum of its proper divisors (27043678206).

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

16891165890 is a wasteful number, since it uses less digits than its factorization.

16891165890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76135 (or 76132 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 16891165890 in words is "sixteen billion, eight hundred ninety-one million, one hundred sixty-five thousand, eight hundred ninety".