6559920397 has 2 divisors, whose sum is σ = 6559920398. Its totient is φ = 6559920396.

The previous prime is 6559920383. The next prime is 6559920421. The reversal of 6559920397 is 7930299556.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6390243721 + 169676676 = 79939^2 + 13026^2 .

It is a cyclic number.

It is not a de Polignac number, because 6559920397 - 2¹⁵ = 6559887629 is a prime.

It is a super-2 number, since 2×6559920397² = 86065111229953275218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6559920307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279960198 + 3279960199.

It is an arithmetic number, because the mean of its divisors is an integer number (3279960199).

Almost surely, 2^6559920397 is an apocalyptic number.

It is an amenable number.

6559920397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6559920397 is an equidigital number, since it uses as much as digits as its factorization.

6559920397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4592700, while the sum is 55.

The square root of 6559920397 is about 80993.3355097813. The cubic root of 6559920397 is about 1871.9727526845.

The spelling of 6559920397 in words is "six billion, five hundred fifty-nine million, nine hundred twenty thousand, three hundred ninety-seven".