166321427 has 2 divisors, whose sum is σ = 166321428. Its totient is φ = 166321426.

The previous prime is 166321381. The next prime is 166321433. The reversal of 166321427 is 724123661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166321427 - 2⁸ = 166321171 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166321393 and 166321402.

It is not a weakly prime, because it can be changed into another prime (163321427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83160713 + 83160714.

It is an arithmetic number, because the mean of its divisors is an integer number (83160714).

Almost surely, 2^166321427 is an apocalyptic number.

166321427 is a deficient number, since it is larger than the sum of its proper divisors (1).

166321427 is an equidigital number, since it uses as much as digits as its factorization.

166321427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 166321427 is about 12896.5664810445. The cubic root of 166321427 is about 549.9409600537.

The spelling of 166321427 in words is "one hundred sixty-six million, three hundred twenty-one thousand, four hundred twenty-seven".