40155666 has 16 divisors (see below), whose sum is σ = 85035744. Its totient is φ = 12597824.

The previous prime is 40155653. The next prime is 40155671. The reversal of 40155666 is 66655104.

It is a super-2 number, since 2×40155666² = 3224955023807112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196740 + ... + 196943.

It is an arithmetic number, because the mean of its divisors is an integer number (5314734).

Almost surely, 2^40155666 is an apocalyptic number.

40155666 is an abundant number, since it is smaller than the sum of its proper divisors (44880078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40155666 is a wasteful number, since it uses less digits than its factorization.

40155666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393705.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 40155666 is about 6336.8498483079. The cubic root of 40155666 is about 342.4382569363.

The spelling of 40155666 in words is "forty million, one hundred fifty-five thousand, six hundred sixty-six".