6618859397 has 2 divisors, whose sum is σ = 6618859398. Its totient is φ = 6618859396.

The previous prime is 6618859349. The next prime is 6618859421. The reversal of 6618859397 is 7939588166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5854392196 + 764467201 = 76514^2 + 27649^2 .

It is a cyclic number.

It is not a de Polignac number, because 6618859397 - 2¹² = 6618855301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6618859307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3309429698 + 3309429699.

It is an arithmetic number, because the mean of its divisors is an integer number (3309429699).

Almost surely, 2^6618859397 is an apocalyptic number.

It is an amenable number.

6618859397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6618859397 is an equidigital number, since it uses as much as digits as its factorization.

6618859397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 62.

The square root of 6618859397 is about 81356.3728112310. The cubic root of 6618859397 is about 1877.5624245395.

The spelling of 6618859397 in words is "six billion, six hundred eighteen million, eight hundred fifty-nine thousand, three hundred ninety-seven".