56985407989 has 2 divisors, whose sum is σ = 56985407990. Its totient is φ = 56985407988.

The previous prime is 56985407951. The next prime is 56985408083. The reversal of 56985407989 is 98970458965.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50696124964 + 6289283025 = 225158^2 + 79305^2 .

It is a cyclic number.

It is not a de Polignac number, because 56985407989 - 2⁹ = 56985407477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56985407929) 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 as a sum of consecutive naturals, namely, 28492703994 + 28492703995.

It is an arithmetic number, because the mean of its divisors is an integer number (28492703995).

Almost surely, 2^56985407989 is an apocalyptic number.

It is an amenable number.

56985407989 is a deficient number, since it is larger than the sum of its proper divisors (1).

56985407989 is an equidigital number, since it uses as much as digits as its factorization.

56985407989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 195955200, while the sum is 70.

The spelling of 56985407989 in words is "fifty-six billion, nine hundred eighty-five million, four hundred seven thousand, nine hundred eighty-nine".