166945405 has 8 divisors (see below), whose sum is σ = 218546784. Its totient is φ = 121414800.

The previous prime is 166945403. The next prime is 166945433. The reversal of 166945405 is 504549661.

It is a happy number.

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

It is not a de Polignac number, because 166945405 - 2¹ = 166945403 is a prime.

It is a super-2 number, since 2×166945405² = 55741536501228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166945403) 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, 1517631 + ... + 1517740.

It is an arithmetic number, because the mean of its divisors is an integer number (27318348).

Almost surely, 2^166945405 is an apocalyptic number.

It is an amenable number.

166945405 is a deficient number, since it is larger than the sum of its proper divisors (51601379).

166945405 is a wasteful number, since it uses less digits than its factorization.

166945405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3035387.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 166945405 is about 12920.7354666830. The cubic root of 166945405 is about 550.6278285116.

It can be divided in two parts, 1669 and 45405, that added together give a palindrome (47074).

The spelling of 166945405 in words is "one hundred sixty-six million, nine hundred forty-five thousand, four hundred five".