19378422487391 has 16 divisors (see below), whose sum is σ = 21154608597408. Its totient is φ = 17604656294400.

The previous prime is 19378422487387. The next prime is 19378422487423.

19378422487391 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 19378422487391 - 2² = 19378422487387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19378422487331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574652411 + ... + 574686131.

It is an arithmetic number, because the mean of its divisors is an integer number (1322163037338).

Almost surely, 2^{19378422487391} is an apocalyptic number.

19378422487391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19378422487391 is a deficient number, since it is larger than the sum of its proper divisors (1776186110017).

19378422487391 is a wasteful number, since it uses less digits than its factorization.

19378422487391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68042.

The product of its digits is 146313216, while the sum is 68.

The spelling of 19378422487391 in words is "nineteen trillion, three hundred seventy-eight billion, four hundred twenty-two million, four hundred eighty-seven thousand, three hundred ninety-one".