6559920391 has 4 divisors (see below), whose sum is σ = 6586055784. Its totient is φ = 6533785000.

The previous prime is 6559920383. The next prime is 6559920397. The reversal of 6559920391 is 1930299556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6559920391 - 2³ = 6559920383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6559920397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13067320 + ... + 13067821.

It is an arithmetic number, because the mean of its divisors is an integer number (1646513946).

Almost surely, 2^6559920391 is an apocalyptic number.

6559920391 is a deficient number, since it is larger than the sum of its proper divisors (26135393).

6559920391 is a wasteful number, since it uses less digits than its factorization.

6559920391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26135392.

The product of its (nonzero) digits is 656100, while the sum is 49.

The square root of 6559920391 is about 80993.3354727412. The cubic root of 6559920391 is about 1871.9727521138.

The spelling of 6559920391 in words is "six billion, five hundred fifty-nine million, nine hundred twenty thousand, three hundred ninety-one".