1305434666 has 8 divisors (see below), whose sum is σ = 2011075140. Its totient is φ = 635076288.

The previous prime is 1305434639. The next prime is 1305434687. The reversal of 1305434666 is 6664345031.

It can be written as a sum of positive squares in 2 ways, for example, as 1073938441 + 231496225 = 32771^2 + 15215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 8820431 + ... + 8820578.

Almost surely, 2^1305434666 is an apocalyptic number.

1305434666 is a deficient number, since it is larger than the sum of its proper divisors (705640474).

1305434666 is a wasteful number, since it uses less digits than its factorization.

1305434666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17641048.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 1305434666 is about 36130.7994099217. The cubic root of 1305434666 is about 1092.9116291043.

Adding to 1305434666 its reverse (6664345031), we get a palindrome (7969779697).

The spelling of 1305434666 in words is "one billion, three hundred five million, four hundred thirty-four thousand, six hundred sixty-six".