18667208060556 has 48 divisors (see below), whose sum is σ = 47543269952640. Its totient is φ = 5653546341120.

The previous prime is 18667208060533. The next prime is 18667208060563. The reversal of 18667208060556 is 65506080276681.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18667208060556.

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, 39556726 + ... + 40025853.

It is an arithmetic number, because the mean of its divisors is an integer number (990484790680).

Almost surely, 2^{18667208060556} is an apocalyptic number.

It is an amenable number.

18667208060556 is an abundant number, since it is smaller than the sum of its proper divisors (28876061892084).

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

18667208060556 is a wasteful number, since it uses less digits than its factorization.

18667208060556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79584374 (or 79584372 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 60.

The spelling of 18667208060556 in words is "eighteen trillion, six hundred sixty-seven billion, two hundred eight million, sixty thousand, five hundred fifty-six".