166355537 has 4 divisors (see below), whose sum is σ = 166473060. Its totient is φ = 166238016.

The previous prime is 166355533. The next prime is 166355543. The reversal of 166355537 is 735553661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 735553661 = 1129 ⋅651509.

It can be written as a sum of positive squares in 2 ways, for example, as 118897216 + 47458321 = 10904^2 + 6889^2 .

It is a cyclic number.

It is not a de Polignac number, because 166355537 - 2² = 166355533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166355494 and 166355503.

It is not an unprimeable number, because it can be changed into a prime (166355533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56612 + ... + 59477.

It is an arithmetic number, because the mean of its divisors is an integer number (41618265).

Almost surely, 2^166355537 is an apocalyptic number.

It is an amenable number.

166355537 is a deficient number, since it is larger than the sum of its proper divisors (117523).

166355537 is a wasteful number, since it uses less digits than its factorization.

166355537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117522.

The product of its digits is 283500, while the sum is 41.

The square root of 166355537 is about 12897.8888582589. Note that the first 4 decimals coincide. The cubic root of 166355537 is about 549.9785523317.

The spelling of 166355537 in words is "one hundred sixty-six million, three hundred fifty-five thousand, five hundred thirty-seven".