556854655661 has 2 divisors, whose sum is σ = 556854655662. Its totient is φ = 556854655660.

The previous prime is 556854655627. The next prime is 556854655697. The reversal of 556854655661 is 166556458655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514348586761 + 42506068900 = 717181^2 + 206170^2 .

It is a cyclic number.

It is not a de Polignac number, because 556854655661 - 2³⁴ = 539674786477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 556854655594 and 556854655603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556854955661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278427327830 + 278427327831.

It is an arithmetic number, because the mean of its divisors is an integer number (278427327831).

Almost surely, 2^556854655661 is an apocalyptic number.

It is an amenable number.

556854655661 is a deficient number, since it is larger than the sum of its proper divisors (1).

556854655661 is an equidigital number, since it uses as much as digits as its factorization.

556854655661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600000, while the sum is 62.

The spelling of 556854655661 in words is "five hundred fifty-six billion, eight hundred fifty-four million, six hundred fifty-five thousand, six hundred sixty-one".