85555553 has 2 divisors, whose sum is σ = 85555554. Its totient is φ = 85555552.

The previous prime is 85555529. The next prime is 85555571. The reversal of 85555553 is 35555558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76597504 + 8958049 = 8752^2 + 2993^2 .

It is a cyclic number.

It is not a de Polignac number, because 85555553 - 2⁸ = 85555297 is a prime.

It is a super-3 number, since 3×85555553³ (a number of 25 digits) contains 333 as substring.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 85555553.

It is not a weakly prime, because it can be changed into another prime (85555523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42777776 + 42777777.

It is an arithmetic number, because the mean of its divisors is an integer number (42777777).

Almost surely, 2^85555553 is an apocalyptic number.

It is an amenable number.

85555553 is a deficient number, since it is larger than the sum of its proper divisors (1).

85555553 is an equidigital number, since it uses as much as digits as its factorization.

85555553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 375000, while the sum is 41.

The square root of 85555553 is about 9249.6244788640. The cubic root of 85555553 is about 440.6387983741.

It can be divided in two parts, 8555555 and 3, that added together give a palindrome (8555558).

The spelling of 85555553 in words is "eighty-five million, five hundred fifty-five thousand, five hundred fifty-three".