1001600666 has 32 divisors (see below), whose sum is σ = 1700611200. Its totient is φ = 438249280.

The previous prime is 1001600651. The next prime is 1001600681. The reversal of 1001600666 is 6660061001.

It is an interprime number because it is at equal distance from previous prime (1001600651) and next prime (1001600681).

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, 226856 + ... + 231228.

It is an arithmetic number, because the mean of its divisors is an integer number (53144100).

Almost surely, 2^1001600666 is an apocalyptic number.

1001600666 is a deficient number, since it is larger than the sum of its proper divisors (699010534).

1001600666 is a wasteful number, since it uses less digits than its factorization.

1001600666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1001600666 is about 31648.0752337326. The cubic root of 1001600666 is about 1000.5332709049.

Adding to 1001600666 its reverse (6660061001), we get a palindrome (7661661667).

The spelling of 1001600666 in words is "one billion, one million, six hundred thousand, six hundred sixty-six".