18370278369 has 9 divisors (see below), whose sum is σ = 26535433873. Its totient is φ = 12246581172.

The previous prime is 18370278343. The next prime is 18370278373. The reversal of 18370278369 is 96387207381.

The square root of 18370278369 is 135537.

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

18370278369 is a `hidden beast` number, since 1 + 8 + 3 + 7 + 0 + 278 + 369 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18370278369 - 2⁹ = 18370277857 is a prime.

It is a super-2 number, since 2×18370278369² (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 (18370278379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 384022 + ... + 429200.

Almost surely, 2^18370278369 is an apocalyptic number.

18370278369 is the 135537-th square number.

18370278369 is the 67769-th centered octagonal number.

It is an amenable number.

18370278369 is a deficient number, since it is larger than the sum of its proper divisors (8165155504).

18370278369 is an frugal number, since it uses more digits than its factorization.

18370278369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90364 (or 45182 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 18370278369 in words is "eighteen billion, three hundred seventy million, two hundred seventy-eight thousand, three hundred sixty-nine".