1556166042 has 48 divisors (see below), whose sum is σ = 3492801000. Its totient is φ = 500140032.

The previous prime is 1556166011. The next prime is 1556166047. The reversal of 1556166042 is 2406616551.

1556166042 is a `hidden beast` number, since 1 + 556 + 1 + 6 + 60 + 42 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 953512641 + 602653401 = 30879^2 + 24549^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1556165988 and 1556166006.

It is not an unprimeable number, because it can be changed into a prime (1556166047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483334 + ... + 486542.

Almost surely, 2^1556166042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556166042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746400500).

1556166042 is an abundant number, since it is smaller than the sum of its proper divisors (1936634958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1556166042 is a wasteful number, since it uses less digits than its factorization.

1556166042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175 (or 4172 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1556166042 is about 39448.2704563838. The cubic root of 1556166042 is about 1158.8271046956.

The spelling of 1556166042 in words is "one billion, five hundred fifty-six million, one hundred sixty-six thousand, forty-two".