1245717665 has 8 divisors (see below), whose sum is σ = 1535263080. Its totient is φ = 969639552.

The previous prime is 1245717659. The next prime is 1245717677. The reversal of 1245717665 is 5667175421.

It can be written as a sum of positive squares in 4 ways, for example, as 132894784 + 1112822881 = 11528^2 + 33359^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1245717665 - 2⁶ = 1245717601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3366620 + ... + 3366989.

It is an arithmetic number, because the mean of its divisors is an integer number (191907885).

Almost surely, 2^1245717665 is an apocalyptic number.

It is an amenable number.

1245717665 is a deficient number, since it is larger than the sum of its proper divisors (289545415).

1245717665 is an equidigital number, since it uses as much as digits as its factorization.

1245717665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733651.

The product of its digits is 352800, while the sum is 44.

The square root of 1245717665 is about 35294.7257391243. The cubic root of 1245717665 is about 1075.9858027659.

The spelling of 1245717665 in words is "one billion, two hundred forty-five million, seven hundred seventeen thousand, six hundred sixty-five".