1556201066 has 32 divisors (see below), whose sum is σ = 2699136000. Its totient is φ = 659135232.

The previous prime is 1556201057. The next prime is 1556201069. The reversal of 1556201066 is 6601026551.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1556201069) 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 15 ways as a sum of consecutive naturals, for example, 729890 + ... + 732018.

It is an arithmetic number, because the mean of its divisors is an integer number (84348000).

Almost surely, 2^1556201066 is an apocalyptic number.

1556201066 is a deficient number, since it is larger than the sum of its proper divisors (1142934934).

1556201066 is a wasteful number, since it uses less digits than its factorization.

1556201066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1556201066 is about 39448.7143770237. The cubic root of 1556201066 is about 1158.8357983815.

The spelling of 1556201066 in words is "one billion, five hundred fifty-six million, two hundred one thousand, sixty-six".