561601601651 has 2 divisors, whose sum is σ = 561601601652. Its totient is φ = 561601601650.

The previous prime is 561601601621. The next prime is 561601601653. The reversal of 561601601651 is 156106106165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561601601651 - 2¹⁰ = 561601600627 is a prime.

It is a Sophie Germain prime.

Together with 561601601653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (561601601653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280800800825 + 280800800826.

It is an arithmetic number, because the mean of its divisors is an integer number (280800800826).

Almost surely, 2^561601601651 is an apocalyptic number.

561601601651 is a deficient number, since it is larger than the sum of its proper divisors (1).

561601601651 is an equidigital number, since it uses as much as digits as its factorization.

561601601651 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 561601601651 in words is "five hundred sixty-one billion, six hundred one million, six hundred one thousand, six hundred fifty-one".