166425031 has 4 divisors (see below), whose sum is σ = 168040912. Its totient is φ = 164809152.

The previous prime is 166425029. The next prime is 166425037. The reversal of 166425031 is 130524661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130524661 = 19 ⋅6869719.

It is a cyclic number.

It is not a de Polignac number, because 166425031 - 2¹ = 166425029 is a prime.

It is a super-2 number, since 2×166425031² = 55394581886701922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166425037) 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, 807786 + ... + 807991.

It is an arithmetic number, because the mean of its divisors is an integer number (42010228).

Almost surely, 2^166425031 is an apocalyptic number.

166425031 is a deficient number, since it is larger than the sum of its proper divisors (1615881).

166425031 is a wasteful number, since it uses less digits than its factorization.

166425031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615880.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 166425031 is about 12900.5825837440. The cubic root of 166425031 is about 550.0551250533.

Adding to 166425031 its reverse (130524661), we get a palindrome (296949692).

The spelling of 166425031 in words is "one hundred sixty-six million, four hundred twenty-five thousand, thirty-one".