166851868540 has 48 divisors (see below), whose sum is σ = 413362059264. Its totient is φ = 55360987200.

The previous prime is 166851868523. The next prime is 166851868553. The reversal of 166851868540 is 45868158661.

It is a happy number.

166851868540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19218226 + ... + 19226905.

It is an arithmetic number, because the mean of its divisors is an integer number (8611709568).

Almost surely, 2^166851868540 is an apocalyptic number.

166851868540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166851868540 is an abundant number, since it is smaller than the sum of its proper divisors (246510190724).

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

166851868540 is a wasteful number, since it uses less digits than its factorization.

166851868540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38445178 (or 38445176 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 58.

The spelling of 166851868540 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, five hundred forty".