19986063623 has 4 divisors (see below), whose sum is σ = 20073339240. Its totient is φ = 19898788008.

The previous prime is 19986063593. The next prime is 19986063637. The reversal of 19986063623 is 32636068991.

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 19986063623 - 2⁸ = 19986063367 is a prime.

It is a super-2 number, since 2×19986063623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19986062623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43637465 + ... + 43637922.

It is an arithmetic number, because the mean of its divisors is an integer number (5018334810).

Almost surely, 2^19986063623 is an apocalyptic number.

19986063623 is a deficient number, since it is larger than the sum of its proper divisors (87275617).

19986063623 is an equidigital number, since it uses as much as digits as its factorization.

19986063623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87275616.

The product of its (nonzero) digits is 2519424, while the sum is 53.

The spelling of 19986063623 in words is "nineteen billion, nine hundred eighty-six million, sixty-three thousand, six hundred twenty-three".