12851780649840 has 400 divisors, whose sum is σ = 48716321955840. Its totient is φ = 3114153008640.

The previous prime is 12851780649839. The next prime is 12851780649847. The reversal of 12851780649840 is 4894608715821.

12851780649840 is a `hidden beast` number, since 1 + 28 + 5 + 1 + 7 + 80 + 6 + 498 + 40 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12851780649847) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 159555657 + ... + 159636183.

Almost surely, 2^{12851780649840} is an apocalyptic number.

12851780649840 is a gapful number since it is divisible by the number (10) 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 12851780649840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24358160977920).

12851780649840 is an abundant number, since it is smaller than the sum of its proper divisors (35864541306000).

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

12851780649840 is a wasteful number, since it uses less digits than its factorization.

12851780649840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82802 (or 82787 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 63.

The spelling of 12851780649840 in words is "twelve trillion, eight hundred fifty-one billion, seven hundred eighty million, six hundred forty-nine thousand, eight hundred forty".