166565641 has 8 divisors (see below), whose sum is σ = 181835424. Its totient is φ = 151317120.

The previous prime is 166565629. The next prime is 166565653. The reversal of 166565641 is 146565661.

It is an interprime number because it is at equal distance from previous prime (166565629) and next prime (166565653).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166565641 - 2⁷ = 166565513 is a prime.

It is a super-2 number, since 2×166565641² = 55488225523481762, 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 = 166565594 and 166565603.

It is not an unprimeable number, because it can be changed into a prime (166565671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14206 + ... + 23128.

It is an arithmetic number, because the mean of its divisors is an integer number (22729428).

Almost surely, 2^166565641 is an apocalyptic number.

166565641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166565641 is a deficient number, since it is larger than the sum of its proper divisors (15269783).

166565641 is a wasteful number, since it uses less digits than its factorization.

166565641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631.

The product of its digits is 129600, while the sum is 40.

The square root of 166565641 is about 12906.0311870071. The cubic root of 166565641 is about 550.2099925409.

The spelling of 166565641 in words is "one hundred sixty-six million, five hundred sixty-five thousand, six hundred forty-one".