1078790105665 has 4 divisors (see below), whose sum is σ = 1294548126804. Its totient is φ = 863032084528.

The previous prime is 1078790105623. The next prime is 1078790105671. The reversal of 1078790105665 is 5665010978701.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286036710976 + 792753394689 = 534824^2 + 890367^2 .

It is a cyclic number.

It is not a de Polignac number, because 1078790105665 - 2¹⁷ = 1078789974593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107879010562 + ... + 107879010571.

It is an arithmetic number, because the mean of its divisors is an integer number (323637031701).

Almost surely, 2^{1078790105665} is an apocalyptic number.

It is an amenable number.

1078790105665 is a deficient number, since it is larger than the sum of its proper divisors (215758021139).

1078790105665 is an equidigital number, since it uses as much as digits as its factorization.

1078790105665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215758021138.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 1078790105665 in words is "one trillion, seventy-eight billion, seven hundred ninety million, one hundred five thousand, six hundred sixty-five".