166720007 has 2 divisors, whose sum is σ = 166720008. Its totient is φ = 166720006.

The previous prime is 166719997. The next prime is 166720019. The reversal of 166720007 is 700027661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166720007 - 2⁴ = 166719991 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 (166720907) 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 as a sum of consecutive naturals, namely, 83360003 + 83360004.

It is an arithmetic number, because the mean of its divisors is an integer number (83360004).

Almost surely, 2^166720007 is an apocalyptic number.

166720007 is a deficient number, since it is larger than the sum of its proper divisors (1).

166720007 is an equidigital number, since it uses as much as digits as its factorization.

166720007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 166720007 is about 12912.0101843206. The cubic root of 166720007 is about 550.3799105205.

Adding to 166720007 its reverse (700027661), we get a palindrome (866747668).

The spelling of 166720007 in words is "one hundred sixty-six million, seven hundred twenty thousand, seven".