4398985561 has 2 divisors, whose sum is σ = 4398985562. Its totient is φ = 4398985560.

The previous prime is 4398985541. The next prime is 4398985579. The reversal of 4398985561 is 1655898934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4379792400 + 19193161 = 66180^2 + 4381^2 .

It is a cyclic number.

It is not a de Polignac number, because 4398985561 - 2¹¹ = 4398983513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4398985496 and 4398985505.

It is not a weakly prime, because it can be changed into another prime (4398985511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2199492780 + 2199492781.

It is an arithmetic number, because the mean of its divisors is an integer number (2199492781).

Almost surely, 2^4398985561 is an apocalyptic number.

It is an amenable number.

4398985561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4398985561 is an equidigital number, since it uses as much as digits as its factorization.

4398985561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9331200, while the sum is 58.

The square root of 4398985561 is about 66324.8487446447. The cubic root of 4398985561 is about 1638.5165994840.

The spelling of 4398985561 in words is "four billion, three hundred ninety-eight million, nine hundred eighty-five thousand, five hundred sixty-one".