166731407 has 2 divisors, whose sum is σ = 166731408. Its totient is φ = 166731406.

The previous prime is 166731401. The next prime is 166731437. The reversal of 166731407 is 704137661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166731407 - 2⁴ = 166731391 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 (166731401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83365703 + 83365704.

It is an arithmetic number, because the mean of its divisors is an integer number (83365704).

Almost surely, 2^166731407 is an apocalyptic number.

166731407 is a deficient number, since it is larger than the sum of its proper divisors (1).

166731407 is an equidigital number, since it uses as much as digits as its factorization.

166731407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 166731407 is about 12912.4516262405. The cubic root of 166731407 is about 550.3924548817.

The spelling of 166731407 in words is "one hundred sixty-six million, seven hundred thirty-one thousand, four hundred seven".