1816685369856 has 320 divisors, whose sum is σ = 6161188872960. Its totient is φ = 517747507200.

The previous prime is 1816685369843. The next prime is 1816685369893. The reversal of 1816685369856 is 6589635866181.

It is a happy number.

1816685369856 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 6 + 8 + 536 + 9 + 85 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38780560 + ... + 38827376.

It is an arithmetic number, because the mean of its divisors is an integer number (19253715228).

Almost surely, 2^{1816685369856} is an apocalyptic number.

1816685369856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1816685369856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3080594436480).

1816685369856 is an abundant number, since it is smaller than the sum of its proper divisors (4344503503104).

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

1816685369856 is an equidigital number, since it uses as much as digits as its factorization.

1816685369856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47252 (or 47230 counting only the distinct ones).

The product of its digits is 447897600, while the sum is 72.

The spelling of 1816685369856 in words is "one trillion, eight hundred sixteen billion, six hundred eighty-five million, three hundred sixty-nine thousand, eight hundred fifty-six".