1005666556 has 12 divisors (see below), whose sum is σ = 1760207400. Its totient is φ = 502750160.

The previous prime is 1005666551. The next prime is 1005666577. The reversal of 1005666556 is 6556665001.

It is a super-2 number, since 2×1005666556² = 2022730443713802272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005666551) 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 3 ways as a sum of consecutive naturals, for example, 12291 + ... + 46501.

It is an arithmetic number, because the mean of its divisors is an integer number (146683950).

Almost surely, 2^1005666556 is an apocalyptic number.

It is an amenable number.

1005666556 is a deficient number, since it is larger than the sum of its proper divisors (754540844).

1005666556 is a wasteful number, since it uses less digits than its factorization.

1005666556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41564 (or 41562 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 1005666556 is about 31712.2461519206. The cubic root of 1005666556 is about 1001.8852954275.

The spelling of 1005666556 in words is "one billion, five million, six hundred sixty-six thousand, five hundred fifty-six".