1556422645 has 8 divisors (see below), whose sum is σ = 1902947256. Its totient is φ = 1221644736.

The previous prime is 1556422577. The next prime is 1556422727. The reversal of 1556422645 is 5462246551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 741091729 + 815330916 = 27223^2 + 28554^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1556422645 - 2²⁹ = 1019551733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1556422598 and 1556422607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2936382 + ... + 2936911.

It is an arithmetic number, because the mean of its divisors is an integer number (237868407).

Almost surely, 2^1556422645 is an apocalyptic number.

It is an amenable number.

1556422645 is a deficient number, since it is larger than the sum of its proper divisors (346524611).

1556422645 is an equidigital number, since it uses as much as digits as its factorization.

1556422645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5873351.

The product of its digits is 288000, while the sum is 40.

The square root of 1556422645 is about 39451.5227209293. The cubic root of 1556422645 is about 1158.8907958787.

The spelling of 1556422645 in words is "one billion, five hundred fifty-six million, four hundred twenty-two thousand, six hundred forty-five".