561613651761 has 8 divisors (see below), whose sum is σ = 749423557504. Its totient is φ = 374106423600.

The previous prime is 561613651759. The next prime is 561613651783. The reversal of 561613651761 is 167156316165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561613651761 - 2¹ = 561613651759 is a prime.

It is a super-2 number, since 2×561613651761² (a number of 24 digits) contains 22 as substring.

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 561613651761.

It is not an unprimeable number, because it can be changed into a prime (561613651861) 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 7 ways as a sum of consecutive naturals, for example, 75665065 + ... + 75672486.

It is an arithmetic number, because the mean of its divisors is an integer number (93677944688).

Almost surely, 2^561613651761 is an apocalyptic number.

It is an amenable number.

561613651761 is a deficient number, since it is larger than the sum of its proper divisors (187809905743).

561613651761 is a wasteful number, since it uses less digits than its factorization.

561613651761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151338791.

The product of its digits is 680400, while the sum is 48.

The spelling of 561613651761 in words is "five hundred sixty-one billion, six hundred thirteen million, six hundred fifty-one thousand, seven hundred sixty-one".