166097749 has 2 divisors, whose sum is σ = 166097750. Its totient is φ = 166097748.

The previous prime is 166097747. The next prime is 166097779. The reversal of 166097749 is 947790661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142038724 + 24059025 = 11918^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 166097749 - 2¹ = 166097747 is a prime.

Together with 166097747, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166097747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83048874 + 83048875.

It is an arithmetic number, because the mean of its divisors is an integer number (83048875).

Almost surely, 2^166097749 is an apocalyptic number.

It is an amenable number.

166097749 is a deficient number, since it is larger than the sum of its proper divisors (1).

166097749 is an equidigital number, since it uses as much as digits as its factorization.

166097749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 166097749 is about 12887.8915653415. The cubic root of 166097749 is about 549.6943193956.

The spelling of 166097749 in words is "one hundred sixty-six million, ninety-seven thousand, seven hundred forty-nine".