166257442 has 8 divisors (see below), whose sum is σ = 268569756. Its totient is φ = 76734192.

The previous prime is 166257431. The next prime is 166257473. The reversal of 166257442 is 244752661.

It can be written as a sum of positive squares in 2 ways, for example, as 162333081 + 3924361 = 12741^2 + 1981^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 3197233 + ... + 3197284.

Almost surely, 2^166257442 is an apocalyptic number.

166257442 is a deficient number, since it is larger than the sum of its proper divisors (102312314).

166257442 is a wasteful number, since it uses less digits than its factorization.

166257442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6394532.

The product of its digits is 80640, while the sum is 37.

The square root of 166257442 is about 12894.0855433800. The cubic root of 166257442 is about 549.8704289817.

The spelling of 166257442 in words is "one hundred sixty-six million, two hundred fifty-seven thousand, four hundred forty-two".