166515943 has 16 divisors (see below), whose sum is σ = 191831040. Its totient is φ = 143345880.

The previous prime is 166515919. The next prime is 166515967. The reversal of 166515943 is 349515661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166515919) and next prime (166515967).

It is a de Polignac number, because none of the positive numbers 2^k-166515943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166515896 and 166515905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166515443) 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, 74346 + ... + 76552.

It is an arithmetic number, because the mean of its divisors is an integer number (11989440).

Almost surely, 2^166515943 is an apocalyptic number.

166515943 is a deficient number, since it is larger than the sum of its proper divisors (25315097).

166515943 is an equidigital number, since it uses as much as digits as its factorization.

166515943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275 (or 2237 counting only the distinct ones).

The product of its digits is 97200, while the sum is 40.

The square root of 166515943 is about 12904.1056644775. The cubic root of 166515943 is about 550.1552652553.

The spelling of 166515943 in words is "one hundred sixty-six million, five hundred fifteen thousand, nine hundred forty-three".