166716749 has 2 divisors, whose sum is σ = 166716750. Its totient is φ = 166716748.

The previous prime is 166716643. The next prime is 166716751. The reversal of 166716749 is 947617661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152893225 + 13823524 = 12365^2 + 3718^2 .

It is a cyclic number.

It is not a de Polignac number, because 166716749 - 2⁸ = 166716493 is a prime.

Together with 166716751, 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 (166716049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83358374 + 83358375.

It is an arithmetic number, because the mean of its divisors is an integer number (83358375).

Almost surely, 2^166716749 is an apocalyptic number.

It is an amenable number.

166716749 is a deficient number, since it is larger than the sum of its proper divisors (1).

166716749 is an equidigital number, since it uses as much as digits as its factorization.

166716749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 166716749 is about 12911.8840220938. The cubic root of 166716749 is about 550.3763253690.

The spelling of 166716749 in words is "one hundred sixty-six million, seven hundred sixteen thousand, seven hundred forty-nine".