40661866 has 24 divisors (see below), whose sum is σ = 71820000. Its totient is φ = 17213112.

The previous prime is 40661851. The next prime is 40661867. The reversal of 40661866 is 66816604.

It is not an unprimeable number, because it can be changed into a prime (40661867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5635 + ... + 10633.

It is an arithmetic number, because the mean of its divisors is an integer number (2992500).

Almost surely, 2^40661866 is an apocalyptic number.

40661866 is a deficient number, since it is larger than the sum of its proper divisors (31158134).

40661866 is a wasteful number, since it uses less digits than its factorization.

40661866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5098 (or 5091 counting only the distinct ones).

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

The square root of 40661866 is about 6376.6657431608. The cubic root of 40661866 is about 343.8711715631.

The spelling of 40661866 in words is "forty million, six hundred sixty-one thousand, eight hundred sixty-six".