1001666507 has 4 divisors (see below), whose sum is σ = 1015388040. Its totient is φ = 987944976.

The previous prime is 1001666473. The next prime is 1001666521. The reversal of 1001666507 is 7056661001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1001666507 - 2⁶ = 1001666443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001666587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6860657 + ... + 6860802.

It is an arithmetic number, because the mean of its divisors is an integer number (253847010).

Almost surely, 2^1001666507 is an apocalyptic number.

1001666507 is a deficient number, since it is larger than the sum of its proper divisors (13721533).

1001666507 is an equidigital number, since it uses as much as digits as its factorization.

1001666507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13721532.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 1001666507 is about 31649.1154220778. The cubic root of 1001666507 is about 1000.5551940359. Note that the first 3 decimals are identical.

The spelling of 1001666507 in words is "one billion, one million, six hundred sixty-six thousand, five hundred seven".