18957219473 has 4 divisors (see below), whose sum is σ = 18958381680. Its totient is φ = 18956057268.

The previous prime is 18957219451. The next prime is 18957219499. The reversal of 18957219473 is 37491275981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18957219473 - 2⁸ = 18957219217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18957219433) 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, 556283 + ... + 589376.

It is an arithmetic number, because the mean of its divisors is an integer number (4739595420).

Almost surely, 2^18957219473 is an apocalyptic number.

It is an amenable number.

18957219473 is a deficient number, since it is larger than the sum of its proper divisors (1162207).

18957219473 is a wasteful number, since it uses less digits than its factorization.

18957219473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162206.

The product of its digits is 3810240, while the sum is 56.

The spelling of 18957219473 in words is "eighteen billion, nine hundred fifty-seven million, two hundred nineteen thousand, four hundred seventy-three".