18964499816 has 32 divisors (see below), whose sum is σ = 36748139400. Its totient is φ = 9169090560.

The previous prime is 18964499747. The next prime is 18964499831. The reversal of 18964499816 is 61899446981.

It can be written as a sum of positive squares in 4 ways, for example, as 10528812100 + 8435687716 = 102610^2 + 91846^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218771 + ... + 292898.

Almost surely, 2^18964499816 is an apocalyptic number.

It is an amenable number.

18964499816 is a deficient number, since it is larger than the sum of its proper divisors (17783639584).

18964499816 is a wasteful number, since it uses less digits than its factorization.

18964499816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511829 (or 511825 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 65.

The spelling of 18964499816 in words is "eighteen billion, nine hundred sixty-four million, four hundred ninety-nine thousand, eight hundred sixteen".