18182634649 has 27 divisors (see below), whose sum is σ = 19737674901. Its totient is φ = 16747500600.

The previous prime is 18182634559. The next prime is 18182634653. The reversal of 18182634649 is 94643628181.

The square root of 18182634649 is 134843.

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

It is not a de Polignac number, because 18182634649 - 2⁹ = 18182634137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18182634596 and 18182634605.

It is not an unprimeable number, because it can be changed into a prime (18182634689) 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 26 ways as a sum of consecutive naturals, for example, 120414724 + ... + 120414874.

Almost surely, 2^18182634649 is an apocalyptic number.

18182634649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18182634649 is the 134843-rd square number.

18182634649 is the 67422-nd centered octagonal number.

It is an amenable number.

18182634649 is a deficient number, since it is larger than the sum of its proper divisors (1555040252).

18182634649 is an frugal number, since it uses more digits than its factorization.

18182634649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 217 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 52.

The spelling of 18182634649 in words is "eighteen billion, one hundred eighty-two million, six hundred thirty-four thousand, six hundred forty-nine".