18469625409 has 27 divisors (see below), whose sum is σ = 27034585513. Its totient is φ = 12150815424.

The previous prime is 18469625389. The next prime is 18469625411. The reversal of 18469625409 is 90452696481.

The square root of 18469625409 is 135903.

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

18469625409 is a `hidden beast` number, since 1 + 8 + 4 + 6 + 9 + 625 + 4 + 0 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 815409 + 18468810000 = 903^2 + 135900^2 .

It is not a de Polignac number, because 18469625409 - 2⁷ = 18469625281 is a prime.

It is a super-2 number, since 2×18469625409² (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 (18469625509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 36285847 + ... + 36286355.

Almost surely, 2^18469625409 is an apocalyptic number.

18469625409 is the 135903-rd square number.

18469625409 is the 67952-nd centered octagonal number.

It is an amenable number.

18469625409 is a deficient number, since it is larger than the sum of its proper divisors (8564960104).

18469625409 is an frugal number, since it uses more digits than its factorization.

18469625409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 18469625409 in words is "eighteen billion, four hundred sixty-nine million, six hundred twenty-five thousand, four hundred nine".