2643872566667 has 4 divisors (see below), whose sum is σ = 2650182525480. Its totient is φ = 2637562607856.

The previous prime is 2643872566649. The next prime is 2643872566669. The reversal of 2643872566667 is 7666652783462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2643872566667 - 2⁸ = 2643872566411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2643872566597 and 2643872566606.

It is not an unprimeable number, because it can be changed into a prime (2643872566669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3154978778 + ... + 3154979615.

It is an arithmetic number, because the mean of its divisors is an integer number (662545631370).

Almost surely, 2^{2643872566667} is an apocalyptic number.

2643872566667 is a deficient number, since it is larger than the sum of its proper divisors (6309958813).

2643872566667 is an equidigital number, since it uses as much as digits as its factorization.

2643872566667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6309958812.

The product of its digits is 731566080, while the sum is 68.

The spelling of 2643872566667 in words is "two trillion, six hundred forty-three billion, eight hundred seventy-two million, five hundred sixty-six thousand, six hundred sixty-seven".