166601951 has 2 divisors, whose sum is σ = 166601952. Its totient is φ = 166601950.

The previous prime is 166601933. The next prime is 166601969. The reversal of 166601951 is 159106661.

It is a balanced prime because it is at equal distance from previous prime (166601933) and next prime (166601969).

It is a cyclic number.

It is not a de Polignac number, because 166601951 - 2¹⁸ = 166339807 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 (166601971) 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, 83300975 + 83300976.

It is an arithmetic number, because the mean of its divisors is an integer number (83300976).

Almost surely, 2^166601951 is an apocalyptic number.

166601951 is a deficient number, since it is larger than the sum of its proper divisors (1).

166601951 is an equidigital number, since it uses as much as digits as its factorization.

166601951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 166601951 is about 12907.4378170108. The cubic root of 166601951 is about 550.2499701201.

The spelling of 166601951 in words is "one hundred sixty-six million, six hundred one thousand, nine hundred fifty-one".