2643256305 has 96 divisors (see below), whose sum is σ = 4953312000. Its totient is φ = 1299234816.

The previous prime is 2643256303. The next prime is 2643256309. The reversal of 2643256305 is 5036523462.

2643256305 is a `hidden beast` number, since 2 + 64 + 32 + 563 + 0 + 5 = 666.

It is not a de Polignac number, because 2643256305 - 2¹ = 2643256303 is a prime.

It is a super-3 number, since 3×2643256305³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2643256305.

It is not an unprimeable number, because it can be changed into a prime (2643256303) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13282596 + ... + 13282794.

It is an arithmetic number, because the mean of its divisors is an integer number (51597000).

Almost surely, 2^2643256305 is an apocalyptic number.

It is an amenable number.

2643256305 is a deficient number, since it is larger than the sum of its proper divisors (2310055695).

2643256305 is a wasteful number, since it uses less digits than its factorization.

2643256305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 2643256305 is about 51412.6084243933. The cubic root of 2643256305 is about 1382.6526561078.

Adding to 2643256305 its reverse (5036523462), we get a palindrome (7679779767).

The spelling of 2643256305 in words is "two billion, six hundred forty-three million, two hundred fifty-six thousand, three hundred five".