1766740868665 has 4 divisors (see below), whose sum is σ = 2120089042404. Its totient is φ = 1413392694928.

The previous prime is 1766740868639. The next prime is 1766740868681. The reversal of 1766740868665 is 5668680476671.

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 1325010490281 + 441730378384 = 1151091^2 + 664628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1766740868665 - 2³¹ = 1764593385017 is a prime.

It is a super-2 number, since 2×1766740868665² (a number of 25 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 = 1766740868594 and 1766740868603.

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, 176674086862 + ... + 176674086871.

It is an arithmetic number, because the mean of its divisors is an integer number (530022260601).

Almost surely, 2^{1766740868665} is an apocalyptic number.

It is an amenable number.

1766740868665 is a deficient number, since it is larger than the sum of its proper divisors (353348173739).

1766740868665 is an equidigital number, since it uses as much as digits as its factorization.

1766740868665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353348173738.

The product of its (nonzero) digits is 487710720, while the sum is 70.

The spelling of 1766740868665 in words is "one trillion, seven hundred sixty-six billion, seven hundred forty million, eight hundred sixty-eight thousand, six hundred sixty-five".