1556005105161 has 24 divisors (see below), whose sum is σ = 2424216814656. Its totient is φ = 956052378720.

The previous prime is 1556005105129. The next prime is 1556005105169. The reversal of 1556005105161 is 1615015006551.

It is a happy number.

1556005105161 is a `hidden beast` number, since 1 + 556 + 0 + 0 + 51 + 0 + 51 + 6 + 1 = 666.

It is not a de Polignac number, because 1556005105161 - 2⁵ = 1556005105129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1556005105169) 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 23 ways as a sum of consecutive naturals, for example, 10266285 + ... + 10416746.

It is an arithmetic number, because the mean of its divisors is an integer number (101009033944).

Almost surely, 2^{1556005105161} is an apocalyptic number.

It is an amenable number.

1556005105161 is a deficient number, since it is larger than the sum of its proper divisors (868211709495).

1556005105161 is a wasteful number, since it uses less digits than its factorization.

1556005105161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20683693 (or 20683690 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 1556005105161 in words is "one trillion, five hundred fifty-six billion, five million, one hundred five thousand, one hundred sixty-one".