561606501611 has 8 divisors (see below), whose sum is σ = 572254102800. Its totient is φ = 550960798752.

The previous prime is 561606501601. The next prime is 561606501649. The reversal of 561606501611 is 116105606165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561606501611 is a prime.

It is a super-2 number, since 2×561606501611² (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 (561606501601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129941 + ... + 1067753.

It is an arithmetic number, because the mean of its divisors is an integer number (71531762850).

Almost surely, 2^561606501611 is an apocalyptic number.

561606501611 is a deficient number, since it is larger than the sum of its proper divisors (10647601189).

561606501611 is a wasteful number, since it uses less digits than its factorization.

561606501611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949165.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 561606501611 in words is "five hundred sixty-one billion, six hundred six million, five hundred one thousand, six hundred eleven".