2166454735765 has 8 divisors (see below), whose sum is σ = 2599753710168. Its totient is φ = 1733158437120.

The previous prime is 2166454735751. The next prime is 2166454735777. The reversal of 2166454735765 is 5675374546612.

It can be written as a sum of positive squares in 4 ways, for example, as 387947105316 + 1778507630449 = 622854^2 + 1333607^2 .

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

It is not a de Polignac number, because 2166454735765 - 2¹⁹ = 2166454211477 is a prime.

It is a super-2 number, since 2×2166454735765² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2355145 + ... + 3143185.

It is an arithmetic number, because the mean of its divisors is an integer number (324969213771).

Almost surely, 2^{2166454735765} is an apocalyptic number.

It is an amenable number.

2166454735765 is a deficient number, since it is larger than the sum of its proper divisors (433298974403).

2166454735765 is an equidigital number, since it uses as much as digits as its factorization.

2166454735765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337879.

The product of its digits is 127008000, while the sum is 61.

The spelling of 2166454735765 in words is "two trillion, one hundred sixty-six billion, four hundred fifty-four million, seven hundred thirty-five thousand, seven hundred sixty-five".