18985216453 has 6 divisors (see below), whose sum is σ = 22084843686. Its totient is φ = 16273042632.

The previous prime is 18985216451. The next prime is 18985216489. The reversal of 18985216453 is 35461258981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10945762884 + 8039453569 = 104622^2 + 89663^2 .

It is not a de Polignac number, because 18985216453 - 2¹ = 18985216451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18985216453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985216451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 193726650 + ... + 193726747.

It is an arithmetic number, because the mean of its divisors is an integer number (3680807281).

Almost surely, 2^18985216453 is an apocalyptic number.

It is an amenable number.

18985216453 is a deficient number, since it is larger than the sum of its proper divisors (3099627233).

18985216453 is an equidigital number, since it uses as much as digits as its factorization.

18985216453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387453411 (or 387453404 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 52.

The spelling of 18985216453 in words is "eighteen billion, nine hundred eighty-five million, two hundred sixteen thousand, four hundred fifty-three".