166715749 has 2 divisors, whose sum is σ = 166715750. Its totient is φ = 166715748.

The previous prime is 166715723. The next prime is 166715777. The reversal of 166715749 is 947517661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113571649 + 53144100 = 10657^2 + 7290^2 .

It is a cyclic number.

It is not a de Polignac number, because 166715749 - 2¹³ = 166707557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166715699 and 166715708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166715789) 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, 83357874 + 83357875.

It is an arithmetic number, because the mean of its divisors is an integer number (83357875).

Almost surely, 2^166715749 is an apocalyptic number.

It is an amenable number.

166715749 is a deficient number, since it is larger than the sum of its proper divisors (1).

166715749 is an equidigital number, since it uses as much as digits as its factorization.

166715749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 166715749 is about 12911.8452980200. The cubic root of 166715749 is about 550.3752249449.

The spelling of 166715749 in words is "one hundred sixty-six million, seven hundred fifteen thousand, seven hundred forty-nine".