18145453023505 has 8 divisors (see below), whose sum is σ = 21774566616552. Its totient is φ = 14516347093248.

The previous prime is 18145453023457. The next prime is 18145453023553. The reversal of 18145453023505 is 50532035454181.

It is a Cunningham number, because it is equal to 4259748²+1.

It is an interprime number because it is at equal distance from previous prime (18145453023457) and next prime (18145453023553).

It can be written as a sum of positive squares in 4 ways, for example, as 25932593296 + 18119520430209 = 161036^2 + 4256703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18145453023505 - 2⁷ = 18145453023377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7509727 + ... + 9627403.

It is an arithmetic number, because the mean of its divisors is an integer number (2721820827069).

Almost surely, 2^{18145453023505} is an apocalyptic number.

It is an amenable number.

18145453023505 is a deficient number, since it is larger than the sum of its proper divisors (3629113593047).

18145453023505 is a wasteful number, since it uses less digits than its factorization.

18145453023505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831395.

The product of its (nonzero) digits is 1440000, while the sum is 46.

Adding to 18145453023505 its reverse (50532035454181), we get a palindrome (68677488477686).

The spelling of 18145453023505 in words is "eighteen trillion, one hundred forty-five billion, four hundred fifty-three million, twenty-three thousand, five hundred five".