166171545 has 12 divisors (see below), whose sum is σ = 288030756. Its totient is φ = 88624800.

The previous prime is 166171543. The next prime is 166171559. The reversal of 166171545 is 545171661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 74701449 + 91470096 = 8643^2 + 9564^2 .

It is not a de Polignac number, because 166171545 - 2¹ = 166171543 is a prime.

It is a super-2 number, since 2×166171545² = 55225964735374050, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166171541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1846306 + ... + 1846395.

It is an arithmetic number, because the mean of its divisors is an integer number (24002563).

Almost surely, 2^166171545 is an apocalyptic number.

166171545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166171545 is a deficient number, since it is larger than the sum of its proper divisors (121859211).

166171545 is a wasteful number, since it uses less digits than its factorization.

166171545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692712 (or 3692709 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 166171545 is about 12890.7542448066. The cubic root of 166171545 is about 549.7757157142.

The spelling of 166171545 in words is "one hundred sixty-six million, one hundred seventy-one thousand, five hundred forty-five".