56161601009 has 2 divisors, whose sum is σ = 56161601010. Its totient is φ = 56161601008.

The previous prime is 56161600991. The next prime is 56161601011. The reversal of 56161601009 is 90010616165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38929263025 + 17232337984 = 197305^2 + 131272^2 .

It is a cyclic number.

It is not a de Polignac number, because 56161601009 - 2¹⁶ = 56161535473 is a prime.

Together with 56161601011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56161601009.

It is not a weakly prime, because it can be changed into another prime (56161601029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28080800504 + 28080800505.

It is an arithmetic number, because the mean of its divisors is an integer number (28080800505).

Almost surely, 2^56161601009 is an apocalyptic number.

It is an amenable number.

56161601009 is a deficient number, since it is larger than the sum of its proper divisors (1).

56161601009 is an equidigital number, since it uses as much as digits as its factorization.

56161601009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 56161601009 in words is "fifty-six billion, one hundred sixty-one million, six hundred one thousand, nine".