18816531280363 has 16 divisors (see below), whose sum is σ = 18936707420160. Its totient is φ = 18696808344256.

The previous prime is 18816531280361. The next prime is 18816531280373. The reversal of 18816531280363 is 36308213561881.

It is a cyclic number.

It is not a de Polignac number, because 18816531280363 - 2¹ = 18816531280361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18816531280361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178460406 + ... + 178565812.

It is an arithmetic number, because the mean of its divisors is an integer number (1183544213760).

Almost surely, 2^{18816531280363} is an apocalyptic number.

18816531280363 is a deficient number, since it is larger than the sum of its proper divisors (120176139797).

18816531280363 is a wasteful number, since it uses less digits than its factorization.

18816531280363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107546.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 18816531280363 in words is "eighteen trillion, eight hundred sixteen billion, five hundred thirty-one million, two hundred eighty thousand, three hundred sixty-three".