166553003 has 4 divisors (see below), whose sum is σ = 172296240. Its totient is φ = 160809768.

The previous prime is 166552973. The next prime is 166553027. The reversal of 166553003 is 300355661.

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 166553003 - 2⁸ = 166552747 is a prime.

It is a super-3 number, since 3×166553003³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 5743207 = 166553003 / (1 + 6 + 6 + 5 + 5 + 3 + 0 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166553033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871575 + ... + 2871632.

It is an arithmetic number, because the mean of its divisors is an integer number (43074060).

Almost surely, 2^166553003 is an apocalyptic number.

166553003 is a deficient number, since it is larger than the sum of its proper divisors (5743237).

166553003 is an equidigital number, since it uses as much as digits as its factorization.

166553003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5743236.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 166553003 is about 12905.5415616703. The cubic root of 166553003 is about 550.1960766463.

The spelling of 166553003 in words is "one hundred sixty-six million, five hundred fifty-three thousand, three".