40661555 has 8 divisors (see below), whose sum is σ = 53229744. Its totient is φ = 29572000.

The previous prime is 40661521. The next prime is 40661573. The reversal of 40661555 is 55516604.

40661555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40661555 - 2¹⁰ = 40660531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369596 + ... + 369705.

It is an arithmetic number, because the mean of its divisors is an integer number (6653718).

Almost surely, 2^40661555 is an apocalyptic number.

40661555 is a deficient number, since it is larger than the sum of its proper divisors (12568189).

40661555 is a wasteful number, since it uses less digits than its factorization.

40661555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739317.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 40661555 is about 6376.6413573291. The cubic root of 40661555 is about 343.8702948678.

The spelling of 40661555 in words is "forty million, six hundred sixty-one thousand, five hundred fifty-five".