40661645 has 4 divisors (see below), whose sum is σ = 48793980. Its totient is φ = 32529312.

The previous prime is 40661639. The next prime is 40661669. The reversal of 40661645 is 54616604.

40661645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10510564 + 30151081 = 3242^2 + 5491^2 .

It is a cyclic number.

It is not a de Polignac number, because 40661645 - 2⁸ = 40661389 is a prime.

It is a super-3 number, since 3×40661645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 4066160 + ... + 4066169.

It is an arithmetic number, because the mean of its divisors is an integer number (12198495).

Almost surely, 2^40661645 is an apocalyptic number.

It is an amenable number.

40661645 is a deficient number, since it is larger than the sum of its proper divisors (8132335).

40661645 is an equidigital number, since it uses as much as digits as its factorization.

40661645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8132334.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 40661645 is about 6376.6484143318. The cubic root of 40661645 is about 343.8705485743.

The spelling of 40661645 in words is "forty million, six hundred sixty-one thousand, six hundred forty-five".