18401814219816 has 32 divisors (see below), whose sum is σ = 51116150611200. Its totient is φ = 6133938073200.

The previous prime is 18401814219757. The next prime is 18401814219821. The reversal of 18401814219816 is 61891241810481.

18401814219816 is a `hidden beast` number, since 1 + 8 + 40 + 1 + 81 + 421 + 98 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42596791960 + ... + 42596792391.

It is an arithmetic number, because the mean of its divisors is an integer number (1597379706600).

Almost surely, 2^{18401814219816} is an apocalyptic number.

It is an amenable number.

18401814219816 is an abundant number, since it is smaller than the sum of its proper divisors (32714336391384).

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

18401814219816 is a wasteful number, since it uses less digits than its factorization.

18401814219816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85193584366 (or 85193584356 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 54.

The spelling of 18401814219816 in words is "eighteen trillion, four hundred one billion, eight hundred fourteen million, two hundred nineteen thousand, eight hundred sixteen".