18999471664 has 10 divisors (see below), whose sum is σ = 36811476380. Its totient is φ = 9499735824.

The previous prime is 18999471661. The next prime is 18999471671. The reversal of 18999471664 is 46617499981.

It is a super-2 number, since 2×18999471664² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18999471596 and 18999471605.

It is not an unprimeable number, because it can be changed into a prime (18999471661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593733474 + ... + 593733505.

It is an arithmetic number, because the mean of its divisors is an integer number (3681147638).

Almost surely, 2^18999471664 is an apocalyptic number.

It is an amenable number.

18999471664 is a deficient number, since it is larger than the sum of its proper divisors (17812004716).

18999471664 is a wasteful number, since it uses less digits than its factorization.

18999471664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187466987 (or 1187466981 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 64.

The spelling of 18999471664 in words is "eighteen billion, nine hundred ninety-nine million, four hundred seventy-one thousand, six hundred sixty-four".