20617062617 has 2 divisors, whose sum is σ = 20617062618. Its totient is φ = 20617062616.

The previous prime is 20617062607. The next prime is 20617062619. The reversal of 20617062617 is 71626071602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19862956096 + 754106521 = 140936^2 + 27461^2 .

It is a cyclic number.

It is not a de Polignac number, because 20617062617 - 2¹² = 20617058521 is a prime.

Together with 20617062619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20617062619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308531308 + 10308531309.

It is an arithmetic number, because the mean of its divisors is an integer number (10308531309).

Almost surely, 2^20617062617 is an apocalyptic number.

It is an amenable number.

20617062617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20617062617 is an equidigital number, since it uses as much as digits as its factorization.

20617062617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 20617062617 in words is "twenty billion, six hundred seventeen million, sixty-two thousand, six hundred seventeen".