133566005551 has 4 divisors (see below), whose sum is σ = 145708369704. Its totient is φ = 121423641400.

The previous prime is 133566005527. The next prime is 133566005563. The reversal of 133566005551 is 155500665331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133566005551 - 2¹⁹ = 133565481263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133566005051) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6071182060 + ... + 6071182081.

It is an arithmetic number, because the mean of its divisors is an integer number (36427092426).

Almost surely, 2^133566005551 is an apocalyptic number.

133566005551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133566005551 is a deficient number, since it is larger than the sum of its proper divisors (12142364153).

133566005551 is a wasteful number, since it uses less digits than its factorization.

133566005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12142364152.

The product of its (nonzero) digits is 202500, while the sum is 40.

The spelling of 133566005551 in words is "one hundred thirty-three billion, five hundred sixty-six million, five thousand, five hundred fifty-one".