2645478838393 has 8 divisors (see below), whose sum is σ = 2648758144968. Its totient is φ = 2642201343744.

The previous prime is 2645478838391. The next prime is 2645478838397. The reversal of 2645478838393 is 3938388745462.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 311037097849 + 2334441740544 = 557707^2 + 1527888^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2645478838393 - 2¹ = 2645478838391 is a prime.

It is a super-4 number, since 4×2645478838393⁴ (a number of 51 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2645478838391) 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 7 ways as a sum of consecutive naturals, for example, 2480655 + ... + 3382987.

It is an arithmetic number, because the mean of its divisors is an integer number (331094768121).

Almost surely, 2^{2645478838393} is an apocalyptic number.

It is an amenable number.

2645478838393 is a deficient number, since it is larger than the sum of its proper divisors (3279306575).

2645478838393 is a wasteful number, since it uses less digits than its factorization.

2645478838393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905963.

The product of its digits is 836075520, while the sum is 70.

The spelling of 2645478838393 in words is "two trillion, six hundred forty-five billion, four hundred seventy-eight million, eight hundred thirty-eight thousand, three hundred ninety-three".