6616011509 has 2 divisors, whose sum is σ = 6616011510. Its totient is φ = 6616011508.

The previous prime is 6616011487. The next prime is 6616011517. The reversal of 6616011509 is 9051106166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5028228100 + 1587783409 = 70910^2 + 39847^2 .

It is a cyclic number.

It is not a de Polignac number, because 6616011509 - 2²⁰ = 6614962933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6616011529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308005754 + 3308005755.

It is an arithmetic number, because the mean of its divisors is an integer number (3308005755).

Almost surely, 2^6616011509 is an apocalyptic number.

It is an amenable number.

6616011509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616011509 is an equidigital number, since it uses as much as digits as its factorization.

6616011509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 6616011509 is about 81338.8683779163. The cubic root of 6616011509 is about 1877.2931004634.

The spelling of 6616011509 in words is "six billion, six hundred sixteen million, eleven thousand, five hundred nine".