166651607 has 2 divisors, whose sum is σ = 166651608. Its totient is φ = 166651606.

The previous prime is 166651553. The next prime is 166651637. The reversal of 166651607 is 706156661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166651607 - 2⁶ = 166651543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166651637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83325803 + 83325804.

It is an arithmetic number, because the mean of its divisors is an integer number (83325804).

Almost surely, 2^166651607 is an apocalyptic number.

166651607 is a deficient number, since it is larger than the sum of its proper divisors (1).

166651607 is an equidigital number, since it uses as much as digits as its factorization.

166651607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 166651607 is about 12909.3612158000. The cubic root of 166651607 is about 550.3046323419.

The spelling of 166651607 in words is "one hundred sixty-six million, six hundred fifty-one thousand, six hundred seven".