166541501 has 16 divisors (see below), whose sum is σ = 192643584. Its totient is φ = 141029424.

The previous prime is 166541489. The next prime is 166541509. The reversal of 166541501 is 105145661.

It is a cyclic number.

It is not a de Polignac number, because 166541501 - 2¹⁸ = 166279357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166541509) 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 15 ways as a sum of consecutive naturals, for example, 258686 + ... + 259328.

It is an arithmetic number, because the mean of its divisors is an integer number (12040224).

Almost surely, 2^166541501 is an apocalyptic number.

It is an amenable number.

166541501 is a deficient number, since it is larger than the sum of its proper divisors (26102083).

166541501 is a wasteful number, since it uses less digits than its factorization.

166541501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 166541501 is about 12905.0959314528. The cubic root of 166541501 is about 550.1834110066.

The spelling of 166541501 in words is "one hundred sixty-six million, five hundred forty-one thousand, five hundred one".