40663561 has 8 divisors (see below), whose sum is σ = 41580864. Its totient is φ = 39751920.

The previous prime is 40663559. The next prime is 40663577. The reversal of 40663561 is 16536604.

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 40663561 - 2¹ = 40663559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40693561) 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, 15250 + ... + 17716.

It is an arithmetic number, because the mean of its divisors is an integer number (5197608).

Almost surely, 2^40663561 is an apocalyptic number.

It is an amenable number.

40663561 is a deficient number, since it is larger than the sum of its proper divisors (917303).

40663561 is a wasteful number, since it uses less digits than its factorization.

40663561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 40663561 is about 6376.7986482247. The cubic root of 40663561 is about 343.8759496152.

The spelling of 40663561 in words is "forty million, six hundred sixty-three thousand, five hundred sixty-one".