556643851 has 2 divisors, whose sum is σ = 556643852. Its totient is φ = 556643850.

The previous prime is 556643831. The next prime is 556643881. The reversal of 556643851 is 158346655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 556643851 - 2¹⁹ = 556119563 is a prime.

It is a super-2 number, since 2×556643851² = 619704753712220402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 556643798 and 556643807.

It is not a weakly prime, because it can be changed into another prime (556643821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278321925 + 278321926.

It is an arithmetic number, because the mean of its divisors is an integer number (278321926).

Almost surely, 2^556643851 is an apocalyptic number.

556643851 is a deficient number, since it is larger than the sum of its proper divisors (1).

556643851 is an equidigital number, since it uses as much as digits as its factorization.

556643851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 43.

The square root of 556643851 is about 23593.3009771842. The cubic root of 556643851 is about 822.6071347836.

The spelling of 556643851 in words is "five hundred fifty-six million, six hundred forty-three thousand, eight hundred fifty-one".