555616081 has 2 divisors, whose sum is σ = 555616082. Its totient is φ = 555616080.

The previous prime is 555616079. The next prime is 555616099. The reversal of 555616081 is 180616555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312723856 + 242892225 = 17684^2 + 15585^2 .

It is a cyclic number.

It is not a de Polignac number, because 555616081 - 2¹ = 555616079 is a prime.

It is a super-2 number, since 2×555616081² = 617418458931597122, which contains 22 as substring.

Together with 555616079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 555616081.

It is not a weakly prime, because it can be changed into another prime (555616021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277808040 + 277808041.

It is an arithmetic number, because the mean of its divisors is an integer number (277808041).

Almost surely, 2^555616081 is an apocalyptic number.

It is an amenable number.

555616081 is a deficient number, since it is larger than the sum of its proper divisors (1).

555616081 is an equidigital number, since it uses as much as digits as its factorization.

555616081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 555616081 is about 23571.5099431496. The cubic root of 555616081 is about 822.1005440758.

The spelling of 555616081 in words is "five hundred fifty-five million, six hundred sixteen thousand, eighty-one".