40668661 has 8 divisors (see below), whose sum is σ = 45565344. Its totient is φ = 35971920.

The previous prime is 40668653. The next prime is 40668671. The reversal of 40668661 is 16686604.

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 40668661 - 2³ = 40668653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 40668661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40668671) 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, 49555 + ... + 50368.

It is an arithmetic number, because the mean of its divisors is an integer number (5695668).

Almost surely, 2^40668661 is an apocalyptic number.

It is an amenable number.

40668661 is a deficient number, since it is larger than the sum of its proper divisors (4896683).

40668661 is a wasteful number, since it uses less digits than its factorization.

40668661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99971.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 40668661 is about 6377.1985228625. The cubic root of 40668661 is about 343.8903252542.

The spelling of 40668661 in words is "forty million, six hundred sixty-eight thousand, six hundred sixty-one".