166651349 has 2 divisors, whose sum is σ = 166651350. Its totient is φ = 166651348.

The previous prime is 166651297. The next prime is 166651351. The reversal of 166651349 is 943156661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108784900 + 57866449 = 10430^2 + 7607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166651349 is a prime.

Together with 166651351, 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 (166651249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83325674 + 83325675.

It is an arithmetic number, because the mean of its divisors is an integer number (83325675).

Almost surely, 2^166651349 is an apocalyptic number.

It is an amenable number.

166651349 is a deficient number, since it is larger than the sum of its proper divisors (1).

166651349 is an equidigital number, since it uses as much as digits as its factorization.

166651349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 166651349 is about 12909.3512230476. The cubic root of 166651349 is about 550.3043483589.

The spelling of 166651349 in words is "one hundred sixty-six million, six hundred fifty-one thousand, three hundred forty-nine".