4066561635 has 16 divisors (see below), whose sum is σ = 6507508896. Its totient is φ = 2168496128.

The previous prime is 4066561591. The next prime is 4066561649. The reversal of 4066561635 is 5361656604.

It is a cyclic number.

It is not a de Polignac number, because 4066561635 - 2⁹ = 4066561123 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101977 + ... + 136133.

It is an arithmetic number, because the mean of its divisors is an integer number (406719306).

Almost surely, 2^4066561635 is an apocalyptic number.

4066561635 is a deficient number, since it is larger than the sum of its proper divisors (2440947261).

4066561635 is a wasteful number, since it uses less digits than its factorization.

4066561635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42102.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 4066561635 is about 63769.5980464045. The cubic root of 4066561635 is about 1596.1576597067.

The spelling of 4066561635 in words is "four billion, sixty-six million, five hundred sixty-one thousand, six hundred thirty-five".