19993452155 has 4 divisors (see below), whose sum is σ = 23992142592. Its totient is φ = 15994761720.

The previous prime is 19993452137. The next prime is 19993452187. The reversal of 19993452155 is 55125439991.

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

It is not a de Polignac number, because 19993452155 - 2²⁶ = 19926343291 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19993452097 and 19993452106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1999345211 + ... + 1999345220.

It is an arithmetic number, because the mean of its divisors is an integer number (5998035648).

Almost surely, 2^19993452155 is an apocalyptic number.

19993452155 is a deficient number, since it is larger than the sum of its proper divisors (3998690437).

19993452155 is an equidigital number, since it uses as much as digits as its factorization.

19993452155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998690436.

The product of its digits is 2187000, while the sum is 53.

The spelling of 19993452155 in words is "nineteen billion, nine hundred ninety-three million, four hundred fifty-two thousand, one hundred fifty-five".