166673557 has 4 divisors (see below), whose sum is σ = 167109120. Its totient is φ = 166237996.

The previous prime is 166673543. The next prime is 166673561. The reversal of 166673557 is 755376661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166673557 - 2²³ = 158284949 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 (166673537) 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 3 ways as a sum of consecutive naturals, for example, 217207 + ... + 217972.

It is an arithmetic number, because the mean of its divisors is an integer number (41777280).

Almost surely, 2^166673557 is an apocalyptic number.

It is an amenable number.

166673557 is a deficient number, since it is larger than the sum of its proper divisors (435563).

166673557 is an equidigital number, since it uses as much as digits as its factorization.

166673557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435562.

The product of its digits is 793800, while the sum is 46.

The square root of 166673557 is about 12910.2113460625. The cubic root of 166673557 is about 550.3287918377.

The spelling of 166673557 in words is "one hundred sixty-six million, six hundred seventy-three thousand, five hundred fifty-seven".