1361002666 has 4 divisors (see below), whose sum is σ = 2041504002. Its totient is φ = 680501332.

The previous prime is 1361002649. The next prime is 1361002679. The reversal of 1361002666 is 6662001631.

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

It can be written as a sum of positive squares in only one way, i.e., 1327072041 + 33930625 = 36429^2 + 5825^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340250665 + ... + 340250668.

Almost surely, 2^1361002666 is an apocalyptic number.

1361002666 is a deficient number, since it is larger than the sum of its proper divisors (680501336).

1361002666 is an equidigital number, since it uses as much as digits as its factorization.

1361002666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680501335.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 1361002666 is about 36891.7696241316. The cubic root of 1361002666 is about 1108.2038602987.

The spelling of 1361002666 in words is "one billion, three hundred sixty-one million, two thousand, six hundred sixty-six".