166172441 has 6 divisors (see below), whose sum is σ = 166980942. Its totient is φ = 165365760.

The previous prime is 166172389. The next prime is 166172443. The reversal of 166172441 is 144271661.

It can be written as a sum of positive squares in 3 ways, for example, as 22052416 + 144120025 = 4696^2 + 12005^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166172441 is a prime.

It is a super-2 number, since 2×166172441² = 55226560295796962, 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 = 166172398 and 166172407.

It is not an unprimeable number, because it can be changed into a prime (166172443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215705 + ... + 216473.

It is an arithmetic number, because the mean of its divisors is an integer number (27830157).

Almost surely, 2^166172441 is an apocalyptic number.

It is an amenable number.

166172441 is a deficient number, since it is larger than the sum of its proper divisors (808501).

166172441 is an frugal number, since it uses more digits than its factorization.

166172441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819 (or 1050 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 166172441 is about 12890.7889983507. The cubic root of 166172441 is about 549.7767038459.

The spelling of 166172441 in words is "one hundred sixty-six million, one hundred seventy-two thousand, four hundred forty-one".