1306768661 has 12 divisors (see below), whose sum is σ = 1437638496. Its totient is φ = 1186918920.

The previous prime is 1306768633. The next prime is 1306768679. The reversal of 1306768661 is 1668676031.

It is a de Polignac number, because none of the positive numbers 2^k-1306768661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306768261) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 154016 + ... + 162278.

It is an arithmetic number, because the mean of its divisors is an integer number (119803208).

Almost surely, 2^1306768661 is an apocalyptic number.

1306768661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1306768661 is a deficient number, since it is larger than the sum of its proper divisors (130869835).

1306768661 is a wasteful number, since it uses less digits than its factorization.

1306768661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9592 (or 9581 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1306768661 is about 36149.2553311960. The cubic root of 1306768661 is about 1093.2837764962.

It can be divided in two parts, 1306 and 768661, that added together give a palindrome (769967).

The spelling of 1306768661 in words is "one billion, three hundred six million, seven hundred sixty-eight thousand, six hundred sixty-one".