18645624616 has 64 divisors (see below), whose sum is σ = 39105504000. Its totient is φ = 8282695680.

The previous prime is 18645624583. The next prime is 18645624643. The reversal of 18645624616 is 61642654681.

It is a self number, because there is not a number n which added to its sum of digits gives 18645624616.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 713265 + ... + 738943.

It is an arithmetic number, because the mean of its divisors is an integer number (611023500).

Almost surely, 2^18645624616 is an apocalyptic number.

It is an amenable number.

18645624616 is an abundant number, since it is smaller than the sum of its proper divisors (20459879384).

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

18645624616 is a wasteful number, since it uses less digits than its factorization.

18645624616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26002 (or 25998 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The spelling of 18645624616 in words is "eighteen billion, six hundred forty-five million, six hundred twenty-four thousand, six hundred sixteen".