18216399496 has 32 divisors (see below), whose sum is σ = 34903975680. Its totient is φ = 8908912000.

The previous prime is 18216399451. The next prime is 18216399499. The reversal of 18216399496 is 69499361281.

It is a self number, because there is not a number n which added to its sum of digits gives 18216399496.

It is not an unprimeable number, because it can be changed into a prime (18216399499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633021 + ... + 661171.

It is an arithmetic number, because the mean of its divisors is an integer number (1090749240).

Almost surely, 2^18216399496 is an apocalyptic number.

It is an amenable number.

18216399496 is a deficient number, since it is larger than the sum of its proper divisors (16687576184).

18216399496 is a wasteful number, since it uses less digits than its factorization.

18216399496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29925 (or 29921 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 58.

The spelling of 18216399496 in words is "eighteen billion, two hundred sixteen million, three hundred ninety-nine thousand, four hundred ninety-six".