166706531 has 2 divisors, whose sum is σ = 166706532. Its totient is φ = 166706530.

The previous prime is 166706521. The next prime is 166706537. The reversal of 166706531 is 135607661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166706531 is a prime.

It is a super-2 number, since 2×166706531² = 55582134956107922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 166706491 and 166706500.

It is not a weakly prime, because it can be changed into another prime (166706537) 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, 83353265 + 83353266.

It is an arithmetic number, because the mean of its divisors is an integer number (83353266).

Almost surely, 2^166706531 is an apocalyptic number.

166706531 is a deficient number, since it is larger than the sum of its proper divisors (1).

166706531 is an equidigital number, since it uses as much as digits as its factorization.

166706531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 166706531 is about 12911.4883340380. The cubic root of 166706531 is about 550.3650810275.

The spelling of 166706531 in words is "one hundred sixty-six million, seven hundred six thousand, five hundred thirty-one".