1556553650671 has 2 divisors, whose sum is σ = 1556553650672. Its totient is φ = 1556553650670.

The previous prime is 1556553650627. The next prime is 1556553650689. The reversal of 1556553650671 is 1760563556551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1556553650671 - 2⁷ = 1556553650543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1556553651671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778276825335 + 778276825336.

It is an arithmetic number, because the mean of its divisors is an integer number (778276825336).

Almost surely, 2^{1556553650671} is an apocalyptic number.

1556553650671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556553650671 is an equidigital number, since it uses as much as digits as its factorization.

1556553650671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14175000, while the sum is 55.

The spelling of 1556553650671 in words is "one trillion, five hundred fifty-six billion, five hundred fifty-three million, six hundred fifty thousand, six hundred seventy-one".