19440281933891 has 16 divisors (see below), whose sum is σ = 23935043283648. Its totient is φ = 15375830400000.

The previous prime is 19440281933873. The next prime is 19440281933911. The reversal of 19440281933891 is 19833918204491.

It is not a de Polignac number, because 19440281933891 - 2⁶ = 19440281933827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19440281930891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37879610 + ... + 38389391.

It is an arithmetic number, because the mean of its divisors is an integer number (1495940205228).

Almost surely, 2^{19440281933891} is an apocalyptic number.

19440281933891 is a deficient number, since it is larger than the sum of its proper divisors (4494761349757).

19440281933891 is a wasteful number, since it uses less digits than its factorization.

19440281933891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76271822.

The product of its (nonzero) digits is 13436928, while the sum is 62.

The spelling of 19440281933891 in words is "nineteen trillion, four hundred forty billion, two hundred eighty-one million, nine hundred thirty-three thousand, eight hundred ninety-one".