166953791 has 2 divisors, whose sum is σ = 166953792. Its totient is φ = 166953790.

The previous prime is 166953769. The next prime is 166953797. The reversal of 166953791 is 197359661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166953791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166953797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83476895 + 83476896.

It is an arithmetic number, because the mean of its divisors is an integer number (83476896).

Almost surely, 2^166953791 is an apocalyptic number.

166953791 is a deficient number, since it is larger than the sum of its proper divisors (1).

166953791 is an equidigital number, since it uses as much as digits as its factorization.

166953791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 166953791 is about 12921.0599797385. The cubic root of 166953791 is about 550.6370480678.

The spelling of 166953791 in words is "one hundred sixty-six million, nine hundred fifty-three thousand, seven hundred ninety-one".