561001116651 has 4 divisors (see below), whose sum is σ = 748001488872. Its totient is φ = 374000744432.

The previous prime is 561001116589. The next prime is 561001116719. The reversal of 561001116651 is 156611100165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561001116651 - 2¹⁸ = 561000854507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561001116251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93500186106 + ... + 93500186111.

It is an arithmetic number, because the mean of its divisors is an integer number (187000372218).

Almost surely, 2^561001116651 is an apocalyptic number.

561001116651 is a deficient number, since it is larger than the sum of its proper divisors (187000372221).

561001116651 is a wasteful number, since it uses less digits than its factorization.

561001116651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187000372220.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 561001116651 in words is "five hundred sixty-one billion, one million, one hundred sixteen thousand, six hundred fifty-one".