15555550550660 has 24 divisors (see below), whose sum is σ = 32666922680280. Its totient is φ = 6222169453824.

The previous prime is 15555550550543. The next prime is 15555550550677. The reversal of 15555550550660 is 6605505555551.

It can be written as a sum of positive squares in 4 ways, for example, as 574439694724 + 14981110855936 = 757918^2 + 3870544^2 .

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 7 ways as a sum of consecutive naturals, for example, 609809 + ... + 5610968.

It is an arithmetic number, because the mean of its divisors is an integer number (1361121778345).

Almost surely, 2^{15555550550660} is an apocalyptic number.

15555550550660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15555550550660 is an abundant number, since it is smaller than the sum of its proper divisors (17111372129620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15555550550660 is a wasteful number, since it uses less digits than its factorization.

15555550550660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345815 (or 6345813 counting only the distinct ones).

The product of its (nonzero) digits is 14062500, while the sum is 53.

The spelling of 15555550550660 in words is "fifteen trillion, five hundred fifty-five billion, five hundred fifty million, five hundred fifty thousand, six hundred sixty".