19871423913 has 16 divisors (see below), whose sum is σ = 30604118976. Its totient is φ = 11334858240.

The previous prime is 19871423911. The next prime is 19871423927. The reversal of 19871423913 is 31932417891.

It is not a de Polignac number, because 19871423913 - 2¹ = 19871423911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19871423911) 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, 17710156 + ... + 17711277.

It is an arithmetic number, because the mean of its divisors is an integer number (1912757436).

Almost surely, 2^19871423913 is an apocalyptic number.

It is an amenable number.

19871423913 is a deficient number, since it is larger than the sum of its proper divisors (10732695063).

19871423913 is a wasteful number, since it uses less digits than its factorization.

19871423913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35421464.

The product of its digits is 326592, while the sum is 48.

The spelling of 19871423913 in words is "nineteen billion, eight hundred seventy-one million, four hundred twenty-three thousand, nine hundred thirteen".