561211011110001 has 32 divisors (see below), whose sum is σ = 857846537424640. Its totient is φ = 319693115879424.

The previous prime is 561211011109993. The next prime is 561211011110033. The reversal of 561211011110001 is 100011110112165.

It is not a de Polignac number, because 561211011110001 - 2³ = 561211011109993 is a prime.

It is a super-2 number, since 2×561211011110001² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561211011110001.

It is not an unprimeable number, because it can be changed into a prime (561211011110401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23725756 + ... + 41052813.

It is an arithmetic number, because the mean of its divisors is an integer number (26807704294520).

Almost surely, 2^{561211011110001} is an apocalyptic number.

It is an amenable number.

561211011110001 is a deficient number, since it is larger than the sum of its proper divisors (296635526314639).

561211011110001 is a wasteful number, since it uses less digits than its factorization.

561211011110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64779865.

The product of its (nonzero) digits is 60, while the sum is 21.

Adding to 561211011110001 its reverse (100011110112165), we get a palindrome (661222121222166).

The spelling of 561211011110001 in words is "five hundred sixty-one trillion, two hundred eleven billion, eleven million, one hundred ten thousand, one".