1556226543 has 4 divisors (see below), whose sum is σ = 2074968728. Its totient is φ = 1037484360.

The previous prime is 1556226533. The next prime is 1556226557. The reversal of 1556226543 is 3456226551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3456226551 = 3 ⋅1152075517.

It is not a de Polignac number, because 1556226543 - 2⁴ = 1556226527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556226533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259371088 + ... + 259371093.

It is an arithmetic number, because the mean of its divisors is an integer number (518742182).

Almost surely, 2^1556226543 is an apocalyptic number.

1556226543 is a deficient number, since it is larger than the sum of its proper divisors (518742185).

1556226543 is an equidigital number, since it uses as much as digits as its factorization.

1556226543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518742184.

The product of its digits is 216000, while the sum is 39.

The square root of 1556226543 is about 39449.0372886335. The cubic root of 1556226543 is about 1158.8421222212.

It can be divided in two parts, 155622 and 6543, that added together give a triangular number (162165 = T₅₆₉).

The spelling of 1556226543 in words is "one billion, five hundred fifty-six million, two hundred twenty-six thousand, five hundred forty-three".