7798394665 has 8 divisors (see below), whose sum is σ = 9398238408. Its totient is φ = 6211939200.

The previous prime is 7798394657. The next prime is 7798394699. The reversal of 7798394665 is 5664938977.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 652904704 + 7145489961 = 25552^2 + 84531^2 .

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

It is not a de Polignac number, because 7798394665 - 2³ = 7798394657 is a prime.

It is a super-2 number, since 2×7798394665² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7798394597 and 7798394606.

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, 3345786 + ... + 3348115.

It is an arithmetic number, because the mean of its divisors is an integer number (1174779801).

Almost surely, 2^7798394665 is an apocalyptic number.

It is an amenable number.

7798394665 is a deficient number, since it is larger than the sum of its proper divisors (1599843743).

7798394665 is a wasteful number, since it uses less digits than its factorization.

7798394665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6694139.

The product of its digits is 68584320, while the sum is 64.

The square root of 7798394665 is about 88308.5197758404. The cubic root of 7798394665 is about 1983.0564182900.

The spelling of 7798394665 in words is "seven billion, seven hundred ninety-eight million, three hundred ninety-four thousand, six hundred sixty-five".