18668338550 has 24 divisors (see below), whose sum is σ = 34729138800. Its totient is φ = 7466038880.

The previous prime is 18668338547. The next prime is 18668338561. The reversal of 18668338550 is 5583386681.

It is a super-2 number, since 2×18668338550² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18668338492 and 18668338501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290231 + ... + 348669.

It is an arithmetic number, because the mean of its divisors is an integer number (1447047450).

Almost surely, 2^18668338550 is an apocalyptic number.

18668338550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18668338550 is a deficient number, since it is larger than the sum of its proper divisors (16060800250).

18668338550 is a wasteful number, since it uses less digits than its factorization.

18668338550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64840 (or 64835 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 18668338550 in words is "eighteen billion, six hundred sixty-eight million, three hundred thirty-eight thousand, five hundred fifty".