19811237734036 has 144 divisors (see below), whose sum is σ = 42638938755840. Its totient is φ = 8008395816960.

The previous prime is 19811237734031. The next prime is 19811237734091. The reversal of 19811237734036 is 63043773211891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19811237734031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2648203416 + ... + 2648210896.

It is an arithmetic number, because the mean of its divisors is an integer number (296103741360).

Almost surely, 2^{19811237734036} 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 19811237734036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21319469377920).

19811237734036 is an abundant number, since it is smaller than the sum of its proper divisors (22827701021804).

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

19811237734036 is a wasteful number, since it uses less digits than its factorization.

19811237734036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10542 (or 10533 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 19811237734036 in words is "nineteen trillion, eight hundred eleven billion, two hundred thirty-seven million, seven hundred thirty-four thousand, thirty-six".