166438151 has 4 divisors (see below), whose sum is σ = 181568904. Its totient is φ = 151307400.

The previous prime is 166438141. The next prime is 166438169. The reversal of 166438151 is 151834661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166438151 - 2⁶ = 166438087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166438141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7565360 + ... + 7565381.

It is an arithmetic number, because the mean of its divisors is an integer number (45392226).

Almost surely, 2^166438151 is an apocalyptic number.

166438151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166438151 is a deficient number, since it is larger than the sum of its proper divisors (15130753).

166438151 is a wasteful number, since it uses less digits than its factorization.

166438151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15130752.

The product of its digits is 17280, while the sum is 35.

The square root of 166438151 is about 12901.0910778895. The cubic root of 166438151 is about 550.0695790761.

Multiplying 166438151 by its sum of digits (35), we get a palindrome (5825335285).

The spelling of 166438151 in words is "one hundred sixty-six million, four hundred thirty-eight thousand, one hundred fifty-one".