1001061005556 has 24 divisors (see below), whose sum is σ = 2335837122304. Its totient is φ = 333682986240.

The previous prime is 1001061005537. The next prime is 1001061005647. The reversal of 1001061005556 is 6555001601001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640836 + ... + 1553316.

Almost surely, 2^{1001061005556} is an apocalyptic number.

It is an amenable number.

1001061005556 is an abundant number, since it is smaller than the sum of its proper divisors (1334776116748).

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

1001061005556 is a wasteful number, since it uses less digits than its factorization.

1001061005556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003911 (or 1003909 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

Adding to 1001061005556 its reverse (6555001601001), we get a palindrome (7556062606557).

The spelling of 1001061005556 in words is "one trillion, one billion, sixty-one million, five thousand, five hundred fifty-six".