166303553 has 4 divisors (see below), whose sum is σ = 179096148. Its totient is φ = 153510960.

The previous prime is 166303549. The next prime is 166303597. The reversal of 166303553 is 355303661.

166303553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355303661 = 83 ⋅4280767.

It can be written as a sum of positive squares in 2 ways, for example, as 54937744 + 111365809 = 7412^2 + 10553^2 .

It is a cyclic number.

It is not a de Polignac number, because 166303553 - 2² = 166303549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166303853) 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, 6396278 + ... + 6396303.

It is an arithmetic number, because the mean of its divisors is an integer number (44774037).

Almost surely, 2^166303553 is an apocalyptic number.

166303553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166303553 is a deficient number, since it is larger than the sum of its proper divisors (12792595).

166303553 is a wasteful number, since it uses less digits than its factorization.

166303553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12792594.

The product of its (nonzero) digits is 24300, while the sum is 32.

The square root of 166303553 is about 12895.8734872827. The cubic root of 166303553 is about 549.9212592510.

The spelling of 166303553 in words is "one hundred sixty-six million, three hundred three thousand, five hundred fifty-three".