19982563487 has 4 divisors (see below), whose sum is σ = 21158008416. Its totient is φ = 18807118560.

The previous prime is 19982563483. The next prime is 19982563501. The reversal of 19982563487 is 78436528991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19982563487 - 2² = 19982563483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19982563483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587722439 + ... + 587722472.

It is an arithmetic number, because the mean of its divisors is an integer number (5289502104).

Almost surely, 2^19982563487 is an apocalyptic number.

19982563487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

19982563487 is a deficient number, since it is larger than the sum of its proper divisors (1175444929).

19982563487 is a wasteful number, since it uses less digits than its factorization.

19982563487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175444928.

The product of its digits is 26127360, while the sum is 62.

The spelling of 19982563487 in words is "nineteen billion, nine hundred eighty-two million, five hundred sixty-three thousand, four hundred eighty-seven".