555715561 has 2 divisors, whose sum is σ = 555715562. Its totient is φ = 555715560.

The previous prime is 555715549. The next prime is 555715571. The reversal of 555715561 is 165517555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489781161 + 65934400 = 22131^2 + 8120^2 .

It is a cyclic number.

It is not a de Polignac number, because 555715561 - 2⁵ = 555715529 is a prime.

It is not a weakly prime, because it can be changed into another prime (555715571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277857780 + 277857781.

It is an arithmetic number, because the mean of its divisors is an integer number (277857781).

Almost surely, 2^555715561 is an apocalyptic number.

It is an amenable number.

555715561 is a deficient number, since it is larger than the sum of its proper divisors (1).

555715561 is an equidigital number, since it uses as much as digits as its factorization.

555715561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131250, while the sum is 40.

The square root of 555715561 is about 23573.6200232378. The cubic root of 555715561 is about 822.1496053398.

The spelling of 555715561 in words is "five hundred fifty-five million, seven hundred fifteen thousand, five hundred sixty-one".