166537517 has 4 divisors (see below), whose sum is σ = 172280220. Its totient is φ = 160794816.

The previous prime is 166537499. The next prime is 166537523. The reversal of 166537517 is 715735661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26020201 + 140517316 = 5101^2 + 11854^2 .

It is a cyclic number.

It is not a de Polignac number, because 166537517 - 2⁶ = 166537453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166537537) 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, 2871308 + ... + 2871365.

It is an arithmetic number, because the mean of its divisors is an integer number (43070055).

Almost surely, 2^166537517 is an apocalyptic number.

It is an amenable number.

166537517 is a deficient number, since it is larger than the sum of its proper divisors (5742703).

166537517 is an equidigital number, since it uses as much as digits as its factorization.

166537517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5742702.

The product of its digits is 132300, while the sum is 41.

The square root of 166537517 is about 12904.9415729014. The cubic root of 166537517 is about 550.1790238155.

The spelling of 166537517 in words is "one hundred sixty-six million, five hundred thirty-seven thousand, five hundred seventeen".