166078427 has 4 divisors (see below), whose sum is σ = 169940760. Its totient is φ = 162216096.

The previous prime is 166078399. The next prime is 166078433. The reversal of 166078427 is 724870661.

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 166078427 - 2¹² = 166074331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166077427) 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, 1931102 + ... + 1931187.

It is an arithmetic number, because the mean of its divisors is an integer number (42485190).

Almost surely, 2^166078427 is an apocalyptic number.

166078427 is a deficient number, since it is larger than the sum of its proper divisors (3862333).

166078427 is an equidigital number, since it uses as much as digits as its factorization.

166078427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862332.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 166078427 is about 12887.1419251904. The cubic root of 166078427 is about 549.6730034224.

The spelling of 166078427 in words is "one hundred sixty-six million, seventy-eight thousand, four hundred twenty-seven".