2617620809 has 2 divisors, whose sum is σ = 2617620810. Its totient is φ = 2617620808.

The previous prime is 2617620799. The next prime is 2617620821. The reversal of 2617620809 is 9080267162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1933536784 + 684084025 = 43972^2 + 26155^2 .

It is a cyclic number.

It is not a de Polignac number, because 2617620809 - 2⁴ = 2617620793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2617622809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1308810404 + 1308810405.

It is an arithmetic number, because the mean of its divisors is an integer number (1308810405).

Almost surely, 2^2617620809 is an apocalyptic number.

It is an amenable number.

2617620809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2617620809 is an equidigital number, since it uses as much as digits as its factorization.

2617620809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 2617620809 is about 51162.6896185101. The cubic root of 2617620809 is about 1378.1682637364.

The spelling of 2617620809 in words is "two billion, six hundred seventeen million, six hundred twenty thousand, eight hundred nine".