166315553 has 8 divisors (see below), whose sum is σ = 173937408. Its totient is φ = 158726304.

The previous prime is 166315519. The next prime is 166315571. The reversal of 166315553 is 355513661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166315553 - 2¹⁸ = 166053409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166315153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2600 + ... + 18422.

It is an arithmetic number, because the mean of its divisors is an integer number (21742176).

Almost surely, 2^166315553 is an apocalyptic number.

It is an amenable number.

166315553 is a deficient number, since it is larger than the sum of its proper divisors (7621855).

166315553 is a wasteful number, since it uses less digits than its factorization.

166315553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16303.

The product of its digits is 40500, while the sum is 35.

The square root of 166315553 is about 12896.3387440002. The cubic root of 166315553 is about 549.9344858604.

The spelling of 166315553 in words is "one hundred sixty-six million, three hundred fifteen thousand, five hundred fifty-three".