18518351666850 has 96 divisors (see below), whose sum is σ = 58318110675840. Its totient is φ = 4232766093120.

The previous prime is 18518351666839. The next prime is 18518351666891. The reversal of 18518351666850 is 5866615381581.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 979797517 + ... + 979816416.

It is an arithmetic number, because the mean of its divisors is an integer number (607480319540).

Almost surely, 2^{18518351666850} is an apocalyptic number.

18518351666850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18518351666850 is an abundant number, since it is smaller than the sum of its proper divisors (39799759008990).

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

18518351666850 is a wasteful number, since it uses less digits than its factorization.

18518351666850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959613961 (or 1959613950 counting only the distinct ones).

The product of its (nonzero) digits is 41472000, while the sum is 63.

The spelling of 18518351666850 in words is "eighteen trillion, five hundred eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, eight hundred fifty".