1856442864672 has 240 divisors, whose sum is σ = 6031488355200. Its totient is φ = 555436776960.

The previous prime is 1856442864659. The next prime is 1856442864673. The reversal of 1856442864672 is 2764682446581.

It is a happy number.

1856442864672 is a `hidden beast` number, since 1 + 8 + 5 + 6 + 442 + 86 + 46 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (1856442864673) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1840354 + ... + 2664542.

It is an arithmetic number, because the mean of its divisors is an integer number (25131201480).

Almost surely, 2^{1856442864672} is an apocalyptic number.

1856442864672 is a gapful number since it is divisible by the number (12) 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 1856442864672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3015744177600).

1856442864672 is an abundant number, since it is smaller than the sum of its proper divisors (4175045490528).

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

1856442864672 is a wasteful number, since it uses less digits than its factorization.

1856442864672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824301 (or 824284 counting only the distinct ones).

The product of its digits is 123863040, while the sum is 63.

The spelling of 1856442864672 in words is "one trillion, eight hundred fifty-six billion, four hundred forty-two million, eight hundred sixty-four thousand, six hundred seventy-two".