1556845125673 has 2 divisors, whose sum is σ = 1556845125674. Its totient is φ = 1556845125672.

The previous prime is 1556845125643. The next prime is 1556845125713. The reversal of 1556845125673 is 3765215486551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1409640922089 + 147204203584 = 1187283^2 + 383672^2 .

It is an emirp because it is prime and its reverse (3765215486551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556845125673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1556845125613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778422562836 + 778422562837.

It is an arithmetic number, because the mean of its divisors is an integer number (778422562837).

Almost surely, 2^{1556845125673} is an apocalyptic number.

It is an amenable number.

1556845125673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556845125673 is an equidigital number, since it uses as much as digits as its factorization.

1556845125673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240000, while the sum is 58.

The spelling of 1556845125673 in words is "one trillion, five hundred fifty-six billion, eight hundred forty-five million, one hundred twenty-five thousand, six hundred seventy-three".