4006561123004 has 12 divisors (see below), whose sum is σ = 7648889416728. Its totient is φ = 1821164146800.

The previous prime is 4006561122989. The next prime is 4006561123067. The reversal of 4006561123004 is 4003211656004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45529103627 + ... + 45529103714.

It is an arithmetic number, because the mean of its divisors is an integer number (637407451394).

Almost surely, 2^{4006561123004} is an apocalyptic number.

4006561123004 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

4006561123004 is a deficient number, since it is larger than the sum of its proper divisors (3642328293724).

4006561123004 is a wasteful number, since it uses less digits than its factorization.

4006561123004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91058207356 (or 91058207354 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 4006561123004 its reverse (4003211656004), we get a palindrome (8009772779008).

The spelling of 4006561123004 in words is "four trillion, six billion, five hundred sixty-one million, one hundred twenty-three thousand, four".