166207331 has 4 divisors (see below), whose sum is σ = 166316592. Its totient is φ = 166098072.

The previous prime is 166207309. The next prime is 166207343. The reversal of 166207331 is 133702661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133702661 = 131 ⋅1020631.

It is a cyclic number.

It is not a de Polignac number, because 166207331 - 2⁶ = 166207267 is a prime.

It is a super-2 number, since 2×166207331² = 55249753756287122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166207294 and 166207303.

It is not an unprimeable number, because it can be changed into a prime (166207931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52316 + ... + 55401.

It is an arithmetic number, because the mean of its divisors is an integer number (41579148).

Almost surely, 2^166207331 is an apocalyptic number.

166207331 is a deficient number, since it is larger than the sum of its proper divisors (109261).

166207331 is a wasteful number, since it uses less digits than its factorization.

166207331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109260.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 166207331 is about 12892.1422191969. The cubic root of 166207331 is about 549.8151786712.

Adding to 166207331 its reverse (133702661), we get a palindrome (299909992).

The spelling of 166207331 in words is "one hundred sixty-six million, two hundred seven thousand, three hundred thirty-one".