20649055542617 has 4 divisors (see below), whose sum is σ = 20649094542900. Its totient is φ = 20649016542336.

The previous prime is 20649055542611. The next prime is 20649055542673. The reversal of 20649055542617 is 71624555094602.

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 15091857510976 + 5557198031641 = 3884824^2 + 2357371^2 .

It is a cyclic number.

It is not a de Polignac number, because 20649055542617 - 2⁶ = 20649055542553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20649055542611) 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, 18694868 + ... + 19768565.

It is an arithmetic number, because the mean of its divisors is an integer number (5162273635725).

Almost surely, 2^{20649055542617} is an apocalyptic number.

It is an amenable number.

20649055542617 is a deficient number, since it is larger than the sum of its proper divisors (39000283).

20649055542617 is an equidigital number, since it uses as much as digits as its factorization.

20649055542617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39000282.

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 20649055542617 in words is "twenty trillion, six hundred forty-nine billion, fifty-five million, five hundred forty-two thousand, six hundred seventeen".