7985611553 has 2 divisors, whose sum is σ = 7985611554. Its totient is φ = 7985611552.

The previous prime is 7985611541. The next prime is 7985611567. The reversal of 7985611553 is 3551165897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6918413329 + 1067198224 = 83177^2 + 32668^2 .

It is a cyclic number.

It is not a de Polignac number, because 7985611553 - 2⁶ = 7985611489 is a prime.

It is not a weakly prime, because it can be changed into another prime (7985613553) 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, 3992805776 + 3992805777.

It is an arithmetic number, because the mean of its divisors is an integer number (3992805777).

Almost surely, 2^7985611553 is an apocalyptic number.

It is an amenable number.

7985611553 is a deficient number, since it is larger than the sum of its proper divisors (1).

7985611553 is an equidigital number, since it uses as much as digits as its factorization.

7985611553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134000, while the sum is 50.

The square root of 7985611553 is about 89362.2490372752. The cubic root of 7985611553 is about 1998.8002431857.

The spelling of 7985611553 in words is "seven billion, nine hundred eighty-five million, six hundred eleven thousand, five hundred fifty-three".