6616654399 has 2 divisors, whose sum is σ = 6616654400. Its totient is φ = 6616654398.

The previous prime is 6616654391. The next prime is 6616654427. The reversal of 6616654399 is 9934566166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6616654399 - 2³ = 6616654391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6616654391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308327199 + 3308327200.

It is an arithmetic number, because the mean of its divisors is an integer number (3308327200).

Almost surely, 2^6616654399 is an apocalyptic number.

6616654399 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616654399 is an equidigital number, since it uses as much as digits as its factorization.

6616654399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6298560, while the sum is 55.

The square root of 6616654399 is about 81342.8202055965. The cubic root of 6616654399 is about 1877.3539051678.

The spelling of 6616654399 in words is "six billion, six hundred sixteen million, six hundred fifty-four thousand, three hundred ninety-nine".