41640661 has 4 divisors (see below), whose sum is σ = 41663232. Its totient is φ = 41618092.

The previous prime is 41640631. The next prime is 41640691. The reversal of 41640661 is 16604614.

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 an interprime number because it is at equal distance from previous prime (41640631) and next prime (41640691).

It is a cyclic number.

It is not a de Polignac number, because 41640661 - 2¹¹ = 41638613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41640611) 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, 8245 + ... + 12298.

It is an arithmetic number, because the mean of its divisors is an integer number (10415808).

Almost surely, 2^41640661 is an apocalyptic number.

It is an amenable number.

41640661 is a deficient number, since it is larger than the sum of its proper divisors (22571).

41640661 is a wasteful number, since it uses less digits than its factorization.

41640661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22570.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 41640661 is about 6452.9575389894. The cubic root of 41640661 is about 346.6084968761.

The spelling of 41640661 in words is "forty-one million, six hundred forty thousand, six hundred sixty-one".