1306225665 has 12 divisors (see below), whose sum is σ = 2264124564. Its totient is φ = 696653664.

The previous prime is 1306225649. The next prime is 1306225681. The reversal of 1306225665 is 5665226031.

It is a happy number.

1306225665 is a `hidden beast` number, since 1 + 30 + 62 + 2 + 566 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1306225649) and next prime (1306225681).

It can be written as a sum of positive squares in 2 ways, for example, as 728352144 + 577873521 = 26988^2 + 24039^2 .

It is not a de Polignac number, because 1306225665 - 2⁴ = 1306225649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14513574 + ... + 14513663.

It is an arithmetic number, because the mean of its divisors is an integer number (188677047).

Almost surely, 2^1306225665 is an apocalyptic number.

1306225665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1306225665 is a deficient number, since it is larger than the sum of its proper divisors (957898899).

1306225665 is a wasteful number, since it uses less digits than its factorization.

1306225665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29027248 (or 29027245 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 1306225665 is about 36141.7440780049. The cubic root of 1306225665 is about 1093.1323263378.

The spelling of 1306225665 in words is "one billion, three hundred six million, two hundred twenty-five thousand, six hundred sixty-five".