12781831783381 has 8 divisors (see below), whose sum is σ = 13459447062720. Its totient is φ = 12104705233152.

The previous prime is 12781831783327. The next prime is 12781831783403. The reversal of 12781831783381 is 18338713818721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12781831783381 - 2¹⁵ = 12781831750613 is a prime.

It is a super-2 number, since 2×12781831783381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781831783481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122128585 + ... + 122233198.

It is an arithmetic number, because the mean of its divisors is an integer number (1682430882840).

Almost surely, 2^{12781831783381} is an apocalyptic number.

It is an amenable number.

12781831783381 is a deficient number, since it is larger than the sum of its proper divisors (677615279339).

12781831783381 is a wasteful number, since it uses less digits than its factorization.

12781831783381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244364555.

The product of its digits is 10838016, while the sum is 61.

The spelling of 12781831783381 in words is "twelve trillion, seven hundred eighty-one billion, eight hundred thirty-one million, seven hundred eighty-three thousand, three hundred eighty-one".