18353664436 has 24 divisors (see below), whose sum is σ = 32711200704. Its totient is φ = 9008717760.

The previous prime is 18353664409. The next prime is 18353664437. The reversal of 18353664436 is 63446635381.

It is a self number, because there is not a number n which added to its sum of digits gives 18353664436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18353664437) 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, 72510 + ... + 204853.

It is an arithmetic number, because the mean of its divisors is an integer number (1362966696).

Almost surely, 2^18353664436 is an apocalyptic number.

It is an amenable number.

18353664436 is a deficient number, since it is larger than the sum of its proper divisors (14357536268).

18353664436 is a wasteful number, since it uses less digits than its factorization.

18353664436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277671 (or 277669 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 49.

The spelling of 18353664436 in words is "eighteen billion, three hundred fifty-three million, six hundred sixty-four thousand, four hundred thirty-six".