66231828550 has 12 divisors (see below), whose sum is σ = 123191201196. Its totient is φ = 26492731400.

The previous prime is 66231828529. The next prime is 66231828563. The reversal of 66231828550 is 5582813266.

66231828550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66231828550² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66231828550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662318236 + ... + 662318335.

It is an arithmetic number, because the mean of its divisors is an integer number (10265933433).

Almost surely, 2^66231828550 is an apocalyptic number.

66231828550 is a deficient number, since it is larger than the sum of its proper divisors (56959372646).

66231828550 is a wasteful number, since it uses less digits than its factorization.

66231828550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324636583 (or 1324636578 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 66231828550 in words is "sixty-six billion, two hundred thirty-one million, eight hundred twenty-eight thousand, five hundred fifty".