19818001820016 has 100 divisors (see below), whose sum is σ = 59336945217000. Its totient is φ = 6378207470208.

The previous prime is 19818001819939. The next prime is 19818001820033. The reversal of 19818001820016 is 61002810081891.

It is a super-2 number, since 2×19818001820016² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 263611866 + ... + 263687033.

It is an arithmetic number, because the mean of its divisors is an integer number (593369452170).

Almost surely, 2^{19818001820016} is an apocalyptic number.

19818001820016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19818001820016 is an abundant number, since it is smaller than the sum of its proper divisors (39518943396984).

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

19818001820016 is a wasteful number, since it uses less digits than its factorization.

19818001820016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527298948 (or 527298933 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 45.

The spelling of 19818001820016 in words is "nineteen trillion, eight hundred eighteen billion, one million, eight hundred twenty thousand, sixteen".