1298117665 has 8 divisors (see below), whose sum is σ = 1677567528. Its totient is φ = 958609920.

The previous prime is 1298117663. The next prime is 1298117693. The reversal of 1298117665 is 5667118921.

It can be written as a sum of positive squares in 4 ways, for example, as 78641424 + 1219476241 = 8868^2 + 34921^2 .

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

It is not a de Polignac number, because 1298117665 - 2¹ = 1298117663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1298117663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9985456 + ... + 9985585.

It is an arithmetic number, because the mean of its divisors is an integer number (209695941).

Almost surely, 2^1298117665 is an apocalyptic number.

It is an amenable number.

1298117665 is a deficient number, since it is larger than the sum of its proper divisors (379449863).

1298117665 is a wasteful number, since it uses less digits than its factorization.

1298117665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19971059.

The product of its digits is 181440, while the sum is 46.

The square root of 1298117665 is about 36029.4000088816. The cubic root of 1298117665 is about 1090.8658678403.

The spelling of 1298117665 in words is "one billion, two hundred ninety-eight million, one hundred seventeen thousand, six hundred sixty-five".