18455471964 has 18 divisors (see below), whose sum is σ = 46651332000. Its totient is φ = 6151823976.

The previous prime is 18455471963. The next prime is 18455471971. The reversal of 18455471964 is 46917455481.

18455471964 is a `hidden beast` number, since 1 + 8 + 4 + 5 + 547 + 1 + 96 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 18455471964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18455471963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256325964 + ... + 256326035.

Almost surely, 2^18455471964 is an apocalyptic number.

It is an amenable number.

18455471964 is an abundant number, since it is smaller than the sum of its proper divisors (28195860036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18455471964 is a wasteful number, since it uses less digits than its factorization.

18455471964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512652009 (or 512652004 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 18455471964 in words is "eighteen billion, four hundred fifty-five million, four hundred seventy-one thousand, nine hundred sixty-four".