1351865666 has 8 divisors (see below), whose sum is σ = 2028689724. Its totient is φ = 675635760.

The previous prime is 1351865663. The next prime is 1351865677. The reversal of 1351865666 is 6665681531.

It can be written as a sum of positive squares in 2 ways, for example, as 1249269025 + 102596641 = 35345^2 + 10129^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1351865666.

It is not an unprimeable number, because it can be changed into a prime (1351865663) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 142805 + ... + 151976.

Almost surely, 2^1351865666 is an apocalyptic number.

1351865666 is a deficient number, since it is larger than the sum of its proper divisors (676824058).

1351865666 is a wasteful number, since it uses less digits than its factorization.

1351865666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297076.

The product of its digits is 777600, while the sum is 47.

The square root of 1351865666 is about 36767.7258747397. The cubic root of 1351865666 is about 1105.7183391147.

It can be divided in two parts, 1351865 and 666, that added together give a palindrome (1352531).

The spelling of 1351865666 in words is "one billion, three hundred fifty-one million, eight hundred sixty-five thousand, six hundred sixty-six".