166868537 has 4 divisors (see below), whose sum is σ = 182038416. Its totient is φ = 151698660.

The previous prime is 166868497. The next prime is 166868561. The reversal of 166868537 is 735868661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735868661 = 11 ⋅66897151.

It is a cyclic number.

It is not a de Polignac number, because 166868537 - 2⁸ = 166868281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166868587) 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, 7584923 + ... + 7584944.

It is an arithmetic number, because the mean of its divisors is an integer number (45509604).

Almost surely, 2^166868537 is an apocalyptic number.

It is an amenable number.

166868537 is a deficient number, since it is larger than the sum of its proper divisors (15169879).

166868537 is a wasteful number, since it uses less digits than its factorization.

166868537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15169878.

The product of its digits is 1451520, while the sum is 50.

The square root of 166868537 is about 12917.7605257258. The cubic root of 166868537 is about 550.5433055549.

The spelling of 166868537 in words is "one hundred sixty-six million, eight hundred sixty-eight thousand, five hundred thirty-seven".