166467641 has 4 divisors (see below), whose sum is σ = 166608372. Its totient is φ = 166326912.

The previous prime is 166467619. The next prime is 166467643. The reversal of 166467641 is 146764661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146764661 = 739 ⋅198599.

It can be written as a sum of positive squares in 2 ways, for example, as 106172416 + 60295225 = 10304^2 + 7765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166467641 is a prime.

It is a super-2 number, since 2×166467641² = 55422951000209762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166467643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68576 + ... + 70961.

It is an arithmetic number, because the mean of its divisors is an integer number (41652093).

Almost surely, 2^166467641 is an apocalyptic number.

It is an amenable number.

166467641 is a deficient number, since it is larger than the sum of its proper divisors (140731).

166467641 is a wasteful number, since it uses less digits than its factorization.

166467641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140730.

The product of its digits is 145152, while the sum is 41.

The square root of 166467641 is about 12902.2339538547. The cubic root of 166467641 is about 550.1020648050.

The spelling of 166467641 in words is "one hundred sixty-six million, four hundred sixty-seven thousand, six hundred forty-one".