561700162721 has 16 divisors (see below), whose sum is σ = 600104894400. Its totient is φ = 524197640448.

The previous prime is 561700162703. The next prime is 561700162733. The reversal of 561700162721 is 127261007165.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561700162721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561700168721) 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 15 ways as a sum of consecutive naturals, for example, 871790 + ... + 1372376.

It is an arithmetic number, because the mean of its divisors is an integer number (37506555900).

Almost surely, 2^561700162721 is an apocalyptic number.

It is an amenable number.

561700162721 is a deficient number, since it is larger than the sum of its proper divisors (38404731679).

561700162721 is a wasteful number, since it uses less digits than its factorization.

561700162721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501488.

The product of its (nonzero) digits is 35280, while the sum is 38.

Adding to 561700162721 its reverse (127261007165), we get a palindrome (688961169886).

The spelling of 561700162721 in words is "five hundred sixty-one billion, seven hundred million, one hundred sixty-two thousand, seven hundred twenty-one".