18356393919545 has 16 divisors (see below), whose sum is σ = 24205591248768. Its totient is φ = 13252658643840.

The previous prime is 18356393919529. The next prime is 18356393919559. The reversal of 18356393919545 is 54591939365381.

It is not a de Polignac number, because 18356393919545 - 2⁴ = 18356393919529 is a prime.

It is a Duffinian number.

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, 1218067709 + ... + 1218082778.

It is an arithmetic number, because the mean of its divisors is an integer number (1512849453048).

Almost surely, 2^{18356393919545} is an apocalyptic number.

It is an amenable number.

18356393919545 is a deficient number, since it is larger than the sum of its proper divisors (5849197329223).

18356393919545 is a wasteful number, since it uses less digits than its factorization.

18356393919545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436150640.

The product of its digits is 472392000, while the sum is 71.

The spelling of 18356393919545 in words is "eighteen trillion, three hundred fifty-six billion, three hundred ninety-three million, nine hundred nineteen thousand, five hundred forty-five".