166387903 has 8 divisors (see below), whose sum is σ = 183554640. Its totient is φ = 149561280.

The previous prime is 166387901. The next prime is 166387919. The reversal of 166387903 is 309783661.

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

It is not a de Polignac number, because 166387903 - 2¹ = 166387901 is a prime.

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 166387903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166387901) 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 7 ways as a sum of consecutive naturals, for example, 84000 + ... + 85957.

It is an arithmetic number, because the mean of its divisors is an integer number (22944330).

Almost surely, 2^166387903 is an apocalyptic number.

166387903 is a deficient number, since it is larger than the sum of its proper divisors (17166737).

166387903 is a wasteful number, since it uses less digits than its factorization.

166387903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170057.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 166387903 is about 12899.1434986979. The cubic root of 166387903 is about 550.0142178143.

The spelling of 166387903 in words is "one hundred sixty-six million, three hundred eighty-seven thousand, nine hundred three".