166042427 has 4 divisors (see below), whose sum is σ = 168764496. Its totient is φ = 163320360.

The previous prime is 166042423. The next prime is 166042439. The reversal of 166042427 is 724240661.

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

It is a cyclic number.

It is not a de Polignac number, because 166042427 - 2² = 166042423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166042393 and 166042402.

It is not an unprimeable number, because it can be changed into a prime (166042423) 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, 1360943 + ... + 1361064.

It is an arithmetic number, because the mean of its divisors is an integer number (42191124).

Almost surely, 2^166042427 is an apocalyptic number.

166042427 is a deficient number, since it is larger than the sum of its proper divisors (2722069).

166042427 is an equidigital number, since it uses as much as digits as its factorization.

166042427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722068.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 166042427 is about 12885.7451084522. The cubic root of 166042427 is about 549.6332839187.

The spelling of 166042427 in words is "one hundred sixty-six million, forty-two thousand, four hundred twenty-seven".