1855005553 has 2 divisors, whose sum is σ = 1855005554. Its totient is φ = 1855005552.

The previous prime is 1855005527. The next prime is 1855005601. The reversal of 1855005553 is 3555005581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1433606769 + 421398784 = 37863^2 + 20528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855005553 - 2⁹ = 1855005041 is a prime.

It is not a weakly prime, because it can be changed into another prime (1855006553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927502776 + 927502777.

It is an arithmetic number, because the mean of its divisors is an integer number (927502777).

Almost surely, 2^1855005553 is an apocalyptic number.

It is an amenable number.

1855005553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855005553 is an equidigital number, since it uses as much as digits as its factorization.

1855005553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75000, while the sum is 37.

The square root of 1855005553 is about 43069.7753999252. The cubic root of 1855005553 is about 1228.7072042626.

The spelling of 1855005553 in words is "one billion, eight hundred fifty-five million, five thousand, five hundred fifty-three".