2563941566617 has 4 divisors (see below), whose sum is σ = 2563972537140. Its totient is φ = 2563910596096.

The previous prime is 2563941566609. The next prime is 2563941566633. The reversal of 2563941566617 is 7166651493652.

2563941566617 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 755376527376 + 1808565039241 = 869124^2 + 1344829^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563941566617 - 2³ = 2563941566609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2563941566717) 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, 15360748 + ... + 15526765.

It is an arithmetic number, because the mean of its divisors is an integer number (640993134285).

Almost surely, 2^{2563941566617} is an apocalyptic number.

It is an amenable number.

2563941566617 is a deficient number, since it is larger than the sum of its proper divisors (30970523).

2563941566617 is an equidigital number, since it uses as much as digits as its factorization.

2563941566617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30970522.

The product of its digits is 48988800, while the sum is 61.

The spelling of 2563941566617 in words is "two trillion, five hundred sixty-three billion, nine hundred forty-one million, five hundred sixty-six thousand, six hundred seventeen".