18651848947 has 18 divisors (see below), whose sum is σ = 19469735252. Its totient is φ = 17858569344.

The previous prime is 18651848933. The next prime is 18651848953. The reversal of 18651848947 is 74984815681.

It is a de Polignac number, because none of the positive numbers 2^k-18651848947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18651848927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 52837923 + ... + 52838275.

Almost surely, 2^18651848947 is an apocalyptic number.

18651848947 is a deficient number, since it is larger than the sum of its proper divisors (817886305).

18651848947 is an frugal number, since it uses more digits than its factorization.

18651848947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867 (or 455 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 61.

The spelling of 18651848947 in words is "eighteen billion, six hundred fifty-one million, eight hundred forty-eight thousand, nine hundred forty-seven".