166320769 has 2 divisors, whose sum is σ = 166320770. Its totient is φ = 166320768.

The previous prime is 166320767. The next prime is 166320779. The reversal of 166320769 is 967023661.

166320769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114768369 + 51552400 = 10713^2 + 7180^2 .

It is a cyclic number.

It is not a de Polignac number, because 166320769 - 2¹ = 166320767 is a prime.

It is a super-2 number, since 2×166320769² = 55325196401502722, which contains 22 as substring.

Together with 166320767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166320761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83160384 + 83160385.

It is an arithmetic number, because the mean of its divisors is an integer number (83160385).

Almost surely, 2^166320769 is an apocalyptic number.

It is an amenable number.

166320769 is a deficient number, since it is larger than the sum of its proper divisors (1).

166320769 is an equidigital number, since it uses as much as digits as its factorization.

166320769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 166320769 is about 12896.5409703533. The cubic root of 166320769 is about 549.9402348282.

The spelling of 166320769 in words is "one hundred sixty-six million, three hundred twenty thousand, seven hundred sixty-nine".