18156393508776 has 64 divisors (see below), whose sum is σ = 45503791200000. Its totient is φ = 6037097127936.

The previous prime is 18156393508717. The next prime is 18156393508787. The reversal of 18156393508776 is 67780539365181.

It is a self number, because there is not a number n which added to its sum of digits gives 18156393508776.

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, 42016180 + ... + 42446108.

It is an arithmetic number, because the mean of its divisors is an integer number (710996737500).

Almost surely, 2^{18156393508776} is an apocalyptic number.

It is an amenable number.

18156393508776 is an abundant number, since it is smaller than the sum of its proper divisors (27347397691224).

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

18156393508776 is a wasteful number, since it uses less digits than its factorization.

18156393508776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434306 (or 434302 counting only the distinct ones).

The product of its (nonzero) digits is 228614400, while the sum is 69.

The spelling of 18156393508776 in words is "eighteen trillion, one hundred fifty-six billion, three hundred ninety-three million, five hundred eight thousand, seven hundred seventy-six".