1851381727728 has 160 divisors (see below), whose sum is σ = 5362193256000. Its totient is φ = 546508505088.

The previous prime is 1851381727709. The next prime is 1851381727759. The reversal of 1851381727728 is 8277271831581.

It is a super-2 number, since 2×1851381727728² (a number of 25 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 31 ways as a sum of consecutive naturals, for example, 2515248 + ... + 3166896.

It is an arithmetic number, because the mean of its divisors is an integer number (33513707850).

Almost surely, 2^{1851381727728} 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 1851381727728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2681096628000).

1851381727728 is an abundant number, since it is smaller than the sum of its proper divisors (3510811528272).

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

1851381727728 is a wasteful number, since it uses less digits than its factorization.

1851381727728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651859 (or 651853 counting only the distinct ones).

The product of its digits is 10536960, while the sum is 60.

The spelling of 1851381727728 in words is "one trillion, eight hundred fifty-one billion, three hundred eighty-one million, seven hundred twenty-seven thousand, seven hundred twenty-eight".