18726335734813 has 6 divisors (see below), whose sum is σ = 21783696671166. Its totient is φ = 16051144915512.

The previous prime is 18726335734793. The next prime is 18726335734849. The reversal of 18726335734813 is 31843753362781.

It can be written as a sum of positive squares in only one way, i.e., 17180336936889 + 1545998797924 = 4144917^2 + 1243382^2 .

It is not a de Polignac number, because 18726335734813 - 2¹³ = 18726335726621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18726335734313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191085058470 + ... + 191085058567.

It is an arithmetic number, because the mean of its divisors is an integer number (3630616111861).

Almost surely, 2^{18726335734813} is an apocalyptic number.

It is an amenable number.

18726335734813 is a deficient number, since it is larger than the sum of its proper divisors (3057360936353).

18726335734813 is an equidigital number, since it uses as much as digits as its factorization.

18726335734813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382170117051 (or 382170117044 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 61.

The spelling of 18726335734813 in words is "eighteen trillion, seven hundred twenty-six billion, three hundred thirty-five million, seven hundred thirty-four thousand, eight hundred thirteen".