561005111001 has 16 divisors (see below), whose sum is σ = 757650502400. Its totient is φ = 369183754368.

The previous prime is 561005110997. The next prime is 561005111003. The reversal of 561005111001 is 100111500165.

It is a happy number.

It is not a de Polignac number, because 561005111001 - 2² = 561005110997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561005111003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760965 + ... + 1304253.

It is an arithmetic number, because the mean of its divisors is an integer number (47353156400).

Almost surely, 2^561005111001 is an apocalyptic number.

It is an amenable number.

561005111001 is a deficient number, since it is larger than the sum of its proper divisors (196645391399).

561005111001 is a wasteful number, since it uses less digits than its factorization.

561005111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547728.

The product of its (nonzero) digits is 150, while the sum is 21.

Adding to 561005111001 its reverse (100111500165), we get a palindrome (661116611166).

The spelling of 561005111001 in words is "five hundred sixty-one billion, five million, one hundred eleven thousand, one".