2643123122065 has 4 divisors (see below), whose sum is σ = 3171747746484. Its totient is φ = 2114498497648.

The previous prime is 2643123122047. The next prime is 2643123122089. The reversal of 2643123122065 is 5602213213462.

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 1669514657409 + 973608464656 = 1292097^2 + 986716^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643123122065 - 2³⁵ = 2608763383697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264312312202 + ... + 264312312211.

It is an arithmetic number, because the mean of its divisors is an integer number (792936936621).

Almost surely, 2^{2643123122065} is an apocalyptic number.

It is an amenable number.

2643123122065 is a deficient number, since it is larger than the sum of its proper divisors (528624624419).

2643123122065 is an equidigital number, since it uses as much as digits as its factorization.

2643123122065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528624624418.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 2643123122065 in words is "two trillion, six hundred forty-three billion, one hundred twenty-three million, one hundred twenty-two thousand, sixty-five".