166724869 has 2 divisors, whose sum is σ = 166724870. Its totient is φ = 166724868.

The previous prime is 166724837. The next prime is 166724881. The reversal of 166724869 is 968427661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88172100 + 78552769 = 9390^2 + 8863^2 .

It is a cyclic number.

It is not a de Polignac number, because 166724869 - 2⁵ = 166724837 is a prime.

It is a super-2 number, since 2×166724869² = 55594363886134322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166724809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83362434 + 83362435.

It is an arithmetic number, because the mean of its divisors is an integer number (83362435).

Almost surely, 2^166724869 is an apocalyptic number.

It is an amenable number.

166724869 is a deficient number, since it is larger than the sum of its proper divisors (1).

166724869 is an equidigital number, since it uses as much as digits as its factorization.

166724869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 166724869 is about 12912.1984572729. The cubic root of 166724869 is about 550.3852606505.

The spelling of 166724869 in words is "one hundred sixty-six million, seven hundred twenty-four thousand, eight hundred sixty-nine".