1556406405406 has 16 divisors (see below), whose sum is σ = 2337629538816. Its totient is φ = 777196790656.

The previous prime is 1556406405403. The next prime is 1556406405427. The reversal of 1556406405406 is 6045046046551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556406405403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14579235 + ... + 14685601.

It is an arithmetic number, because the mean of its divisors is an integer number (146101846176).

Almost surely, 2^{1556406405406} is an apocalyptic number.

1556406405406 is a deficient number, since it is larger than the sum of its proper divisors (781223133410).

1556406405406 is a wasteful number, since it uses less digits than its factorization.

1556406405406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115763.

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 1556406405406 in words is "one trillion, five hundred fifty-six billion, four hundred six million, four hundred five thousand, four hundred six".