557289628421 has 2 divisors, whose sum is σ = 557289628422. Its totient is φ = 557289628420.

The previous prime is 557289628351. The next prime is 557289628429. The reversal of 557289628421 is 124826982755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525101680321 + 32187948100 = 724639^2 + 179410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557289628421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557289628429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278644814210 + 278644814211.

It is an arithmetic number, because the mean of its divisors is an integer number (278644814211).

Almost surely, 2^557289628421 is an apocalyptic number.

It is an amenable number.

557289628421 is a deficient number, since it is larger than the sum of its proper divisors (1).

557289628421 is an equidigital number, since it uses as much as digits as its factorization.

557289628421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19353600, while the sum is 59.

The spelling of 557289628421 in words is "five hundred fifty-seven billion, two hundred eighty-nine million, six hundred twenty-eight thousand, four hundred twenty-one".