18642352369 has 3 divisors (see below), whose sum is σ = 18642488907. Its totient is φ = 18642215832.

The previous prime is 18642352363. The next prime is 18642352387. The reversal of 18642352369 is 96325324681.

The square root of 18642352369 is 136537.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13673794225 + 4968558144 = 116935^2 + 70488^2 .

It is not a de Polignac number, because 18642352369 - 2⁷ = 18642352241 is a prime.

It is a super-2 number, since 2×18642352369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18642352363) 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 2 ways as a sum of consecutive naturals, for example, 68269 + ... + 204805.

It is an arithmetic number, because the mean of its divisors is an integer number (6214162969).

Almost surely, 2^18642352369 is an apocalyptic number.

18642352369 is the 136537-th square number.

18642352369 is the 68269-th centered octagonal number.

It is an amenable number.

18642352369 is a deficient number, since it is larger than the sum of its proper divisors (136538).

18642352369 is an frugal number, since it uses more digits than its factorization.

18642352369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273074 (or 136537 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

Multiplying 18642352369 by its sum of digits (49), we get a square (913475266081 = 955759²).

The spelling of 18642352369 in words is "eighteen billion, six hundred forty-two million, three hundred fifty-two thousand, three hundred sixty-nine".