1361819181636 has 96 divisors (see below), whose sum is σ = 3626926087680. Its totient is φ = 441566214912.

The previous prime is 1361819181581. The next prime is 1361819181643. The reversal of 1361819181636 is 6361819181631.

1361819181636 is a `hidden beast` number, since 1 + 3 + 618 + 1 + 9 + 1 + 8 + 16 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 17771941 + ... + 17848403.

It is an arithmetic number, because the mean of its divisors is an integer number (37780480080).

Almost surely, 2^{1361819181636} 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 1361819181636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1813463043840).

1361819181636 is an abundant number, since it is smaller than the sum of its proper divisors (2265106906044).

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

1361819181636 is a wasteful number, since it uses less digits than its factorization.

1361819181636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80970 (or 80962 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The spelling of 1361819181636 in words is "one trillion, three hundred sixty-one billion, eight hundred nineteen million, one hundred eighty-one thousand, six hundred thirty-six".