166957811 has 4 divisors (see below), whose sum is σ = 167650824. Its totient is φ = 166264800.

The previous prime is 166957783. The next prime is 166957823. The reversal of 166957811 is 118759661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166957811 - 2¹⁰ = 166956787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166957841) 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 in 3 ways as a sum of consecutive naturals, for example, 346145 + ... + 346626.

It is an arithmetic number, because the mean of its divisors is an integer number (41912706).

Almost surely, 2^166957811 is an apocalyptic number.

166957811 is a deficient number, since it is larger than the sum of its proper divisors (693013).

166957811 is an equidigital number, since it uses as much as digits as its factorization.

166957811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693012.

The product of its digits is 90720, while the sum is 44.

The square root of 166957811 is about 12921.2155387951. The cubic root of 166957811 is about 550.6414675406.

The spelling of 166957811 in words is "one hundred sixty-six million, nine hundred fifty-seven thousand, eight hundred eleven".