166663951 has 2 divisors, whose sum is σ = 166663952. Its totient is φ = 166663950.

The previous prime is 166663933. The next prime is 166663961. The reversal of 166663951 is 159366661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166663951 - 2⁷ = 166663823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166663898 and 166663907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166663961) 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, 83331975 + 83331976.

It is an arithmetic number, because the mean of its divisors is an integer number (83331976).

Almost surely, 2^166663951 is an apocalyptic number.

166663951 is a deficient number, since it is larger than the sum of its proper divisors (1).

166663951 is an equidigital number, since it uses as much as digits as its factorization.

166663951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 43.

The square root of 166663951 is about 12909.8393096119. The cubic root of 166663951 is about 550.3182191549.

The spelling of 166663951 in words is "one hundred sixty-six million, six hundred sixty-three thousand, nine hundred fifty-one".