1165205426565 has 8 divisors (see below), whose sum is σ = 1864328682528. Its totient is φ = 621442894160.

The previous prime is 1165205426533. The next prime is 1165205426599. The reversal of 1165205426565 is 5656245025611.

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

It is not a de Polignac number, because 1165205426565 - 2⁵ = 1165205426533 is a prime.

It is a congruent number.

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, 38840180871 + ... + 38840180900.

It is an arithmetic number, because the mean of its divisors is an integer number (233041085316).

Almost surely, 2^{1165205426565} is an apocalyptic number.

1165205426565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1165205426565 is a deficient number, since it is larger than the sum of its proper divisors (699123255963).

1165205426565 is an equidigital number, since it uses as much as digits as its factorization.

1165205426565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77680361779.

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 1165205426565 in words is "one trillion, one hundred sixty-five billion, two hundred five million, four hundred twenty-six thousand, five hundred sixty-five".