561104366761 has 3 divisors (see below), whose sum is σ = 561105115831. Its totient is φ = 561103617692.

The previous prime is 561104366737. The next prime is 561104366807. The reversal of 561104366761 is 167663401165.

The square root of 561104366761 is 749069.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 484319956761 + 76784410000 = 695931^2 + 277100^2 .

It is not a de Polignac number, because 561104366761 - 2¹⁹ = 561103842473 is a prime.

It is a super-2 number, since 2×561104366761² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561104366261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 374535 + ... + 1123603.

Almost surely, 2^561104366761 is an apocalyptic number.

561104366761 is the 749069-th square number.

561104366761 is the 374535-th centered octagonal number.

It is an amenable number.

561104366761 is a deficient number, since it is larger than the sum of its proper divisors (749070).

561104366761 is an frugal number, since it uses more digits than its factorization.

561104366761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498138 (or 749069 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 561104366761 in words is "five hundred sixty-one billion, one hundred four million, three hundred sixty-six thousand, seven hundred sixty-one".