1005020666 has 32 divisors (see below), whose sum is σ = 1641862656. Its totient is φ = 458640000.

The previous prime is 1005020633. The next prime is 1005020707. The reversal of 1005020666 is 6660205001.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1102751 + ... + 1103661.

It is an arithmetic number, because the mean of its divisors is an integer number (51308208).

Almost surely, 2^1005020666 is an apocalyptic number.

1005020666 is a deficient number, since it is larger than the sum of its proper divisors (636841990).

1005020666 is a wasteful number, since it uses less digits than its factorization.

1005020666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1005020666 is about 31702.0609109250. The cubic root of 1005020666 is about 1001.6707623319.

Adding to 1005020666 its reverse (6660205001), we get a palindrome (7665225667).

The spelling of 1005020666 in words is "one billion, five million, twenty thousand, six hundred sixty-six".