1812872945664 has 896 divisors, whose sum is σ = 6075288230400. Its totient is φ = 529567580160.

The previous prime is 1812872945651. The next prime is 1812872945687. The reversal of 1812872945664 is 4665492782181.

It is a happy number.

1812872945664 is a `hidden beast` number, since 1 + 8 + 1 + 287 + 294 + 5 + 6 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10479034282 + ... + 10479034454.

Almost surely, 2^{1812872945664} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812872945664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3037644115200).

1812872945664 is an abundant number, since it is smaller than the sum of its proper divisors (4262415284736).

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

1812872945664 is a wasteful number, since it uses less digits than its factorization.

1812872945664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 321 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 1812872945664 in words is "one trillion, eight hundred twelve billion, eight hundred seventy-two million, nine hundred forty-five thousand, six hundred sixty-four".