18309968625 has 32 divisors (see below), whose sum is σ = 32811472512. Its totient is φ = 9014136000.

The previous prime is 18309968617. The next prime is 18309968653. The reversal of 18309968625 is 52686990381.

It is not a de Polignac number, because 18309968625 - 2³ = 18309968617 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1873071 + ... + 1882820.

It is an arithmetic number, because the mean of its divisors is an integer number (1025358516).

Almost surely, 2^18309968625 is an apocalyptic number.

18309968625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18309968625 is a deficient number, since it is larger than the sum of its proper divisors (14501503887).

18309968625 is a wasteful number, since it uses less digits than its factorization.

18309968625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755922 (or 3755912 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 18309968625 in words is "eighteen billion, three hundred nine million, nine hundred sixty-eight thousand, six hundred twenty-five".