16425564989 has 2 divisors, whose sum is σ = 16425564990. Its totient is φ = 16425564988.

The previous prime is 16425564979. The next prime is 16425565021. The reversal of 16425564989 is 98946552461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16424472964 + 1092025 = 128158^2 + 1045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16425564989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16425564929) 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, 8212782494 + 8212782495.

It is an arithmetic number, because the mean of its divisors is an integer number (8212782495).

Almost surely, 2^16425564989 is an apocalyptic number.

It is an amenable number.

16425564989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16425564989 is an equidigital number, since it uses as much as digits as its factorization.

16425564989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18662400, while the sum is 59.

The spelling of 16425564989 in words is "sixteen billion, four hundred twenty-five million, five hundred sixty-four thousand, nine hundred eighty-nine".