556631163509 has 2 divisors, whose sum is σ = 556631163510. Its totient is φ = 556631163508.

The previous prime is 556631163493. The next prime is 556631163601. The reversal of 556631163509 is 905361136655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488107630609 + 68523532900 = 698647^2 + 261770^2 .

It is a cyclic number.

It is not a de Polignac number, because 556631163509 - 2⁴ = 556631163493 is a prime.

It is a super-3 number, since 3×556631163509³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556631663509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278315581754 + 278315581755.

It is an arithmetic number, because the mean of its divisors is an integer number (278315581755).

Almost surely, 2^556631163509 is an apocalyptic number.

It is an amenable number.

556631163509 is a deficient number, since it is larger than the sum of its proper divisors (1).

556631163509 is an equidigital number, since it uses as much as digits as its factorization.

556631163509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187000, while the sum is 50.

The spelling of 556631163509 in words is "five hundred fifty-six billion, six hundred thirty-one million, one hundred sixty-three thousand, five hundred nine".