166601903 has 8 divisors (see below), whose sum is σ = 187218528. Its totient is φ = 147099744.

The previous prime is 166601893. The next prime is 166601917. The reversal of 166601903 is 309106661.

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 166601903 - 2¹⁰ = 166600879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166601903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166601933) 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, 278300 + ... + 278897.

It is an arithmetic number, because the mean of its divisors is an integer number (23402316).

Almost surely, 2^166601903 is an apocalyptic number.

166601903 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166601903 is a deficient number, since it is larger than the sum of its proper divisors (20616625).

166601903 is a wasteful number, since it uses less digits than its factorization.

166601903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557233.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 166601903 is about 12907.4359576176. The cubic root of 166601903 is about 550.2499172756.

The spelling of 166601903 in words is "one hundred sixty-six million, six hundred one thousand, nine hundred three".