166521315 has 8 divisors (see below), whose sum is σ = 266434128. Its totient is φ = 88811360.

The previous prime is 166521293. The next prime is 166521317. The reversal of 166521315 is 513125661.

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

It is not a de Polignac number, because 166521315 - 2¹⁴ = 166504931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166521317) 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, 5550696 + ... + 5550725.

It is an arithmetic number, because the mean of its divisors is an integer number (33304266).

Almost surely, 2^166521315 is an apocalyptic number.

166521315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166521315 is a deficient number, since it is larger than the sum of its proper divisors (99912813).

166521315 is a wasteful number, since it uses less digits than its factorization.

166521315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101429.

The product of its digits is 5400, while the sum is 30.

The square root of 166521315 is about 12904.3138136051. The cubic root of 166521315 is about 550.1611814102.

Adding to 166521315 its reverse (513125661), we get a palindrome (679646976).

The spelling of 166521315 in words is "one hundred sixty-six million, five hundred twenty-one thousand, three hundred fifteen".