55188021668 has 12 divisors (see below), whose sum is σ = 104008194780. Its totient is φ = 25471394592.

The previous prime is 55188021667. The next prime is 55188021671. The reversal of 55188021668 is 86612088155.

It is a happy number.

55188021668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 25998982564 + 29189039104 = 161242^2 + 170848^2 .

It is not an unprimeable number, because it can be changed into a prime (55188021667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530654003 + ... + 530654106.

It is an arithmetic number, because the mean of its divisors is an integer number (8667349565).

Almost surely, 2^55188021668 is an apocalyptic number.

It is an amenable number.

55188021668 is a deficient number, since it is larger than the sum of its proper divisors (48820173112).

55188021668 is a wasteful number, since it uses less digits than its factorization.

55188021668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061308126 (or 1061308124 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 55188021668 in words is "fifty-five billion, one hundred eighty-eight million, twenty-one thousand, six hundred sixty-eight".