18648630909 has 12 divisors (see below), whose sum is σ = 27805844352. Its totient is φ = 12031374600.

The previous prime is 18648630863. The next prime is 18648630911. The reversal of 18648630909 is 90903684681.

It is not a de Polignac number, because 18648630909 - 2¹³ = 18648622717 is a prime.

It is a super-2 number, since 2×18648630909² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18648632909) 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 11 ways as a sum of consecutive naturals, for example, 33420207 + ... + 33420764.

It is an arithmetic number, because the mean of its divisors is an integer number (2317153696).

Almost surely, 2^18648630909 is an apocalyptic number.

It is an amenable number.

18648630909 is a deficient number, since it is larger than the sum of its proper divisors (9157213443).

18648630909 is a wasteful number, since it uses less digits than its factorization.

18648630909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66841008 (or 66841005 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 18648630909 in words is "eighteen billion, six hundred forty-eight million, six hundred thirty thousand, nine hundred nine".