166573831 has 2 divisors, whose sum is σ = 166573832. Its totient is φ = 166573830.

The previous prime is 166573829. The next prime is 166573879. The reversal of 166573831 is 138375661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166573831 - 2¹ = 166573829 is a prime.

It is a super-2 number, since 2×166573831² = 55493682348033122, which contains 22 as substring.

Together with 166573829, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166573811) 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, 83286915 + 83286916.

It is an arithmetic number, because the mean of its divisors is an integer number (83286916).

Almost surely, 2^166573831 is an apocalyptic number.

166573831 is a deficient number, since it is larger than the sum of its proper divisors (1).

166573831 is an equidigital number, since it uses as much as digits as its factorization.

166573831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 166573831 is about 12906.3484766219. The cubic root of 166573831 is about 550.2190102991.

The spelling of 166573831 in words is "one hundred sixty-six million, five hundred seventy-three thousand, eight hundred thirty-one".