18847948541563 has 16 divisors (see below), whose sum is σ = 19041749438400. Its totient is φ = 18655152561664.

The previous prime is 18847948541561. The next prime is 18847948541603. The reversal of 18847948541563 is 36514584974881.

It is a cyclic number.

It is not a de Polignac number, because 18847948541563 - 2¹ = 18847948541561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18847948541561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235727370 + ... + 235807312.

It is an arithmetic number, because the mean of its divisors is an integer number (1190109339900).

Almost surely, 2^{18847948541563} is an apocalyptic number.

18847948541563 is a deficient number, since it is larger than the sum of its proper divisors (193800896837).

18847948541563 is a wasteful number, since it uses less digits than its factorization.

18847948541563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86198.

The product of its digits is 928972800, while the sum is 73.

The spelling of 18847948541563 in words is "eighteen trillion, eight hundred forty-seven billion, nine hundred forty-eight million, five hundred forty-one thousand, five hundred sixty-three".