40566161 has 4 divisors (see below), whose sum is σ = 40945392. Its totient is φ = 40186932.

The previous prime is 40566133. The next prime is 40566191. The reversal of 40566161 is 16166504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40566161 is a prime.

It is a super-2 number, since 2×40566161² = 3291226836555842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40566101) 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, 189455 + ... + 189668.

It is an arithmetic number, because the mean of its divisors is an integer number (10236348).

Almost surely, 2^40566161 is an apocalyptic number.

It is an amenable number.

40566161 is a deficient number, since it is larger than the sum of its proper divisors (379231).

40566161 is a wasteful number, since it uses less digits than its factorization.

40566161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379230.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40566161 is about 6369.1570085844. The cubic root of 40566161 is about 343.6011721136.

It can be divided in two parts, 405 and 66161, that added together give a palindrome (66566).

The spelling of 40566161 in words is "forty million, five hundred sixty-six thousand, one hundred sixty-one".