19993855623 has 8 divisors (see below), whose sum is σ = 30466827648. Its totient is φ = 11425060344.

The previous prime is 19993855619. The next prime is 19993855663. The reversal of 19993855623 is 32655839991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19993855623 - 2² = 19993855619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19993855663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476044161 + ... + 476044202.

It is an arithmetic number, because the mean of its divisors is an integer number (3808353456).

Almost surely, 2^19993855623 is an apocalyptic number.

19993855623 is a deficient number, since it is larger than the sum of its proper divisors (10472972025).

19993855623 is an equidigital number, since it uses as much as digits as its factorization.

19993855623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952088373.

The product of its digits is 15746400, while the sum is 60.

The spelling of 19993855623 in words is "nineteen billion, nine hundred ninety-three million, eight hundred fifty-five thousand, six hundred twenty-three".