16666815018156 has 12 divisors (see below), whose sum is σ = 38889235042392. Its totient is φ = 5555605006048.

The previous prime is 16666815018101. The next prime is 16666815018181. The reversal of 16666815018156 is 65181051866661.

It is a happy number.

16666815018156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 16666815018156.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694450625745 + ... + 694450625768.

It is an arithmetic number, because the mean of its divisors is an integer number (3240769586866).

Almost surely, 2^{16666815018156} is an apocalyptic number.

It is an amenable number.

16666815018156 is an abundant number, since it is smaller than the sum of its proper divisors (22222420024236).

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

16666815018156 is a wasteful number, since it uses less digits than its factorization.

16666815018156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388901251520 (or 1388901251518 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 60.

The spelling of 16666815018156 in words is "sixteen trillion, six hundred sixty-six billion, eight hundred fifteen million, eighteen thousand, one hundred fifty-six".