19455020555 has 4 divisors (see below), whose sum is σ = 23346024672. Its totient is φ = 15564016440.

The previous prime is 19455020551. The next prime is 19455020567. The reversal of 19455020555 is 55502055491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55502055491 = 2213 ⋅25080007.

It is not a de Polignac number, because 19455020555 - 2² = 19455020551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19455020551) 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, 1945502051 + ... + 1945502060.

It is an arithmetic number, because the mean of its divisors is an integer number (5836506168).

Almost surely, 2^19455020555 is an apocalyptic number.

19455020555 is a deficient number, since it is larger than the sum of its proper divisors (3891004117).

19455020555 is an equidigital number, since it uses as much as digits as its factorization.

19455020555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891004116.

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 19455020555 in words is "nineteen billion, four hundred fifty-five million, twenty thousand, five hundred fifty-five".