19879451155 has 4 divisors (see below), whose sum is σ = 23855341392. Its totient is φ = 15903560920.

The previous prime is 19879451153. The next prime is 19879451161. The reversal of 19879451155 is 55115497891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55115497891 = 271 ⋅203378221.

It is not a de Polignac number, because 19879451155 - 2¹ = 19879451153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19879451096 and 19879451105.

It is not an unprimeable number, because it can be changed into a prime (19879451153) 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, 1987945111 + ... + 1987945120.

It is an arithmetic number, because the mean of its divisors is an integer number (5963835348).

Almost surely, 2^19879451155 is an apocalyptic number.

19879451155 is a deficient number, since it is larger than the sum of its proper divisors (3975890237).

19879451155 is an equidigital number, since it uses as much as digits as its factorization.

19879451155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975890236.

The product of its digits is 2268000, while the sum is 55.

The spelling of 19879451155 in words is "nineteen billion, eight hundred seventy-nine million, four hundred fifty-one thousand, one hundred fifty-five".