556076621 has 2 divisors, whose sum is σ = 556076622. Its totient is φ = 556076620.

The previous prime is 556076603. The next prime is 556076627. The reversal of 556076621 is 126670655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486687721 + 69388900 = 22061^2 + 8330^2 .

It is a cyclic number.

It is not a de Polignac number, because 556076621 - 2¹⁸ = 555814477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556076627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278038310 + 278038311.

It is an arithmetic number, because the mean of its divisors is an integer number (278038311).

Almost surely, 2^556076621 is an apocalyptic number.

It is an amenable number.

556076621 is a deficient number, since it is larger than the sum of its proper divisors (1).

556076621 is an equidigital number, since it uses as much as digits as its factorization.

556076621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 556076621 is about 23581.2769162317. The cubic root of 556076621 is about 822.3276227115.

The spelling of 556076621 in words is "five hundred fifty-six million, seventy-six thousand, six hundred twenty-one".