556763320121 has 2 divisors, whose sum is σ = 556763320122. Its totient is φ = 556763320120.

The previous prime is 556763320073. The next prime is 556763320151. The reversal of 556763320121 is 121023367655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332029488400 + 224733831721 = 576220^2 + 474061^2 .

It is a cyclic number.

It is not a de Polignac number, because 556763320121 - 2²⁶ = 556696211257 is a prime.

It is not a weakly prime, because it can be changed into another prime (556763320151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278381660060 + 278381660061.

It is an arithmetic number, because the mean of its divisors is an integer number (278381660061).

Almost surely, 2^556763320121 is an apocalyptic number.

It is an amenable number.

556763320121 is a deficient number, since it is larger than the sum of its proper divisors (1).

556763320121 is an equidigital number, since it uses as much as digits as its factorization.

556763320121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 41.

Adding to 556763320121 its reverse (121023367655), we get a palindrome (677786687776).

The spelling of 556763320121 in words is "five hundred fifty-six billion, seven hundred sixty-three million, three hundred twenty thousand, one hundred twenty-one".