617165561 has 2 divisors, whose sum is σ = 617165562. Its totient is φ = 617165560.

The previous prime is 617165491. The next prime is 617165623. The reversal of 617165561 is 165561716.

617165561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 557196025 + 59969536 = 23605^2 + 7744^2 .

It is a cyclic number.

It is not a de Polignac number, because 617165561 - 2¹⁴ = 617149177 is a prime.

It is not a weakly prime, because it can be changed into another prime (617165261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308582780 + 308582781.

It is an arithmetic number, because the mean of its divisors is an integer number (308582781).

Almost surely, 2^617165561 is an apocalyptic number.

It is an amenable number.

617165561 is a deficient number, since it is larger than the sum of its proper divisors (1).

617165561 is an equidigital number, since it uses as much as digits as its factorization.

617165561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 617165561 is about 24842.8170906602. The cubic root of 617165561 is about 851.4004875531.

It can be divided in two parts, 6171655 and 61, that added together give a palindrome (6171716).

The spelling of 617165561 in words is "six hundred seventeen million, one hundred sixty-five thousand, five hundred sixty-one".