166651007 has 2 divisors, whose sum is σ = 166651008. Its totient is φ = 166651006.

The previous prime is 166651003. The next prime is 166651057. The reversal of 166651007 is 700156661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166651007 - 2² = 166651003 is a prime.

It is a super-2 number, since 2×166651007² = 55545116268228098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166651003) 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, 83325503 + 83325504.

It is an arithmetic number, because the mean of its divisors is an integer number (83325504).

Almost surely, 2^166651007 is an apocalyptic number.

166651007 is a deficient number, since it is larger than the sum of its proper divisors (1).

166651007 is an equidigital number, since it uses as much as digits as its factorization.

166651007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 166651007 is about 12909.3379768290. The cubic root of 166651007 is about 550.3039719159.

The spelling of 166651007 in words is "one hundred sixty-six million, six hundred fifty-one thousand, seven".