166640415 has 32 divisors (see below), whose sum is σ = 275321856. Its totient is φ = 86002560.

The previous prime is 166640413. The next prime is 166640417. The reversal of 166640415 is 514046661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166640413) and next prime (166640417).

It is not a de Polignac number, because 166640415 - 2¹ = 166640413 is a prime.

It is a super-2 number, since 2×166640415² = 55538055822744450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166640413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116394 + ... + 117816.

It is an arithmetic number, because the mean of its divisors is an integer number (8603808).

Almost surely, 2^166640415 is an apocalyptic number.

166640415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166640415 is a deficient number, since it is larger than the sum of its proper divisors (108681441).

166640415 is a wasteful number, since it uses less digits than its factorization.

166640415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 166640415 is about 12908.9277246408. The cubic root of 166640415 is about 550.2923129341.

The spelling of 166640415 in words is "one hundred sixty-six million, six hundred forty thousand, four hundred fifteen".