2745128363669 has 4 divisors (see below), whose sum is σ = 2746011328620. Its totient is φ = 2744245398720.

The previous prime is 2745128363617. The next prime is 2745128363693. The reversal of 2745128363669 is 9663638215472.

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 204729100900 + 2540399262769 = 452470^2 + 1593863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2745128363669 is a prime.

It is a super-2 number, since 2×2745128363669² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2745128363609) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 441477812 + ... + 441484029.

It is an arithmetic number, because the mean of its divisors is an integer number (686502832155).

Almost surely, 2^{2745128363669} is an apocalyptic number.

It is an amenable number.

2745128363669 is a deficient number, since it is larger than the sum of its proper divisors (882964951).

2745128363669 is an equidigital number, since it uses as much as digits as its factorization.

2745128363669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882964950.

The product of its digits is 78382080, while the sum is 62.

The spelling of 2745128363669 in words is "two trillion, seven hundred forty-five billion, one hundred twenty-eight million, three hundred sixty-three thousand, six hundred sixty-nine".