1816851810816 has 960 divisors, whose sum is σ = 6567180744960. Its totient is φ = 493563248640.

The previous prime is 1816851810757. The next prime is 1816851810821. The reversal of 1816851810816 is 6180181586181.

1816851810816 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 8 + 518 + 108 + 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 polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4315562286 + ... + 4315562706.

It is an arithmetic number, because the mean of its divisors is an integer number (6840813276).

Almost surely, 2^{1816851810816} is an apocalyptic number.

1816851810816 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 1816851810816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3283590372480).

1816851810816 is an abundant number, since it is smaller than the sum of its proper divisors (4750328934144).

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

1816851810816 is a wasteful number, since it uses less digits than its factorization.

1816851810816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 54.

The spelling of 1816851810816 in words is "one trillion, eight hundred sixteen billion, eight hundred fifty-one million, eight hundred ten thousand, eight hundred sixteen".