4006561123005 has 16 divisors (see below), whose sum is σ = 7326283196544. Its totient is φ = 1831570799040.

The previous prime is 4006561122989. The next prime is 4006561123067. The reversal of 4006561123005 is 5003211656004.

It is not a de Polignac number, because 4006561123005 - 2⁴ = 4006561122989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19078862386 + ... + 19078862595.

It is an arithmetic number, because the mean of its divisors is an integer number (457892699784).

Almost surely, 2^{4006561123005} is an apocalyptic number.

It is an amenable number.

4006561123005 is a deficient number, since it is larger than the sum of its proper divisors (3319722073539).

4006561123005 is a wasteful number, since it uses less digits than its factorization.

4006561123005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38157724996.

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

Adding to 4006561123005 its reverse (5003211656004), we get a palindrome (9009772779009).

The spelling of 4006561123005 in words is "four trillion, six billion, five hundred sixty-one million, one hundred twenty-three thousand, five".