18302572369 has 9 divisors (see below), whose sum is σ = 18626166363. Its totient is φ = 17984512632.

The previous prime is 18302572357. The next prime is 18302572373. The reversal of 18302572369 is 96327520381.

The square root of 18302572369 is 135287.

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

It can be written as a sum of positive squares in only one way, i.e., 5309308225 + 12993264144 = 72865^2 + 113988^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18302572369 is a prime.

It is a super-2 number, since 2×18302572369² (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 (18302570369) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7980787 + ... + 7983079.

Almost surely, 2^18302572369 is an apocalyptic number.

18302572369 is the 135287-th square number.

18302572369 is the 67644-th centered octagonal number.

It is an amenable number.

18302572369 is a deficient number, since it is larger than the sum of its proper divisors (323593994).

18302572369 is an frugal number, since it uses more digits than its factorization.

18302572369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704 (or 2352 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 18302572369 in words is "eighteen billion, three hundred two million, five hundred seventy-two thousand, three hundred sixty-nine".