166145603 has 8 divisors (see below), whose sum is σ = 179173008. Its totient is φ = 153153504.

The previous prime is 166145599. The next prime is 166145627. The reversal of 166145603 is 306541661.

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 166145603 - 2² = 166145599 is a prime.

It is a super-2 number, since 2×166145603² = 55208722792467218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166145603.

It is not an unprimeable number, because it can be changed into a prime (166145803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1400 + ... + 18282.

It is an arithmetic number, because the mean of its divisors is an integer number (22396626).

Almost surely, 2^166145603 is an apocalyptic number.

166145603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166145603 is a deficient number, since it is larger than the sum of its proper divisors (13027405).

166145603 is a wasteful number, since it uses less digits than its factorization.

166145603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17653.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 166145603 is about 12889.7479804688. The cubic root of 166145603 is about 549.7471046707.

The spelling of 166145603 in words is "one hundred sixty-six million, one hundred forty-five thousand, six hundred three".