18856814534453 has 4 divisors (see below), whose sum is σ = 21550645182240. Its totient is φ = 16162983886668.

The previous prime is 18856814534399. The next prime is 18856814534489. The reversal of 18856814534453 is 35443541865881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18856814534453 - 2¹⁰ = 18856814533429 is a prime.

It is a super-3 number, since 3×18856814534453³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 18856814534453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18856814534153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1346915323883 + ... + 1346915323896.

It is an arithmetic number, because the mean of its divisors is an integer number (5387661295560).

Almost surely, 2^{18856814534453} is an apocalyptic number.

It is an amenable number.

18856814534453 is a deficient number, since it is larger than the sum of its proper divisors (2693830647787).

18856814534453 is an equidigital number, since it uses as much as digits as its factorization.

18856814534453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693830647786.

The product of its digits is 221184000, while the sum is 65.

The spelling of 18856814534453 in words is "eighteen trillion, eight hundred fifty-six billion, eight hundred fourteen million, five hundred thirty-four thousand, four hundred fifty-three".