166345427 has 2 divisors, whose sum is σ = 166345428. Its totient is φ = 166345426.

The previous prime is 166345423. The next prime is 166345447. The reversal of 166345427 is 724543661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (724543661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166345427 - 2² = 166345423 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166345423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83172713 + 83172714.

It is an arithmetic number, because the mean of its divisors is an integer number (83172714).

Almost surely, 2^166345427 is an apocalyptic number.

166345427 is a deficient number, since it is larger than the sum of its proper divisors (1).

166345427 is an equidigital number, since it uses as much as digits as its factorization.

166345427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 166345427 is about 12897.4969276988. The cubic root of 166345427 is about 549.9674107412.

The spelling of 166345427 in words is "one hundred sixty-six million, three hundred forty-five thousand, four hundred twenty-seven".