10001005556 has 12 divisors (see below), whose sum is σ = 17509201668. Its totient is φ = 4998376512.

The previous prime is 10001005541. The next prime is 10001005579. The reversal of 10001005556 is 65550010001.

It can be written as a sum of positive squares in 2 ways, for example, as 6738768100 + 3262237456 = 82090^2 + 57116^2 .

It is a super-2 number, since 2×10001005556² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520961 + ... + 539816.

It is an arithmetic number, because the mean of its divisors is an integer number (1459100139).

Almost surely, 2^10001005556 is an apocalyptic number.

It is an amenable number.

10001005556 is a deficient number, since it is larger than the sum of its proper divisors (7508196112).

10001005556 is a wasteful number, since it uses less digits than its factorization.

10001005556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063138 (or 1063136 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 10001005556 its reverse (65550010001), we get a palindrome (75551015557).

The spelling of 10001005556 in words is "ten billion, one million, five thousand, five hundred fifty-six".