1556315980859 has 2 divisors, whose sum is σ = 1556315980860. Its totient is φ = 1556315980858.

The previous prime is 1556315980789. The next prime is 1556315980861. The reversal of 1556315980859 is 9580895136551.

It is a strong prime.

It is an emirp because it is prime and its reverse (9580895136551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556315980859 is a prime.

It is a super-2 number, since 2×1556315980859² (a number of 25 digits) contains 22 as substring.

Together with 1556315980861, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1556315980795 and 1556315980804.

It is not a weakly prime, because it can be changed into another prime (1556315985859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778157990429 + 778157990430.

It is an arithmetic number, because the mean of its divisors is an integer number (778157990430).

Almost surely, 2^{1556315980859} is an apocalyptic number.

1556315980859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556315980859 is an equidigital number, since it uses as much as digits as its factorization.

1556315980859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320000, while the sum is 65.

The spelling of 1556315980859 in words is "one trillion, five hundred fifty-six billion, three hundred fifteen million, nine hundred eighty thousand, eight hundred fifty-nine".