18508621845 has 64 divisors (see below), whose sum is σ = 34890301440. Its totient is φ = 8203534848.

The previous prime is 18508621843. The next prime is 18508621849. The reversal of 18508621845 is 54812680581.

It is not a de Polignac number, because 18508621845 - 2¹ = 18508621843 is a prime.

It is a super-2 number, since 2×18508621845² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18508621794 and 18508621803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18508621843) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 431772 + ... + 472698.

It is an arithmetic number, because the mean of its divisors is an integer number (545160960).

Almost surely, 2^18508621845 is an apocalyptic number.

18508621845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18508621845 is a deficient number, since it is larger than the sum of its proper divisors (16381679595).

18508621845 is a wasteful number, since it uses less digits than its factorization.

18508621845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41074.

The product of its (nonzero) digits is 614400, while the sum is 48.

The spelling of 18508621845 in words is "eighteen billion, five hundred eight million, six hundred twenty-one thousand, eight hundred forty-five".