6420946559 has 4 divisors (see below), whose sum is σ = 6526208040. Its totient is φ = 6315685080.

The previous prime is 6420946523. The next prime is 6420946601. The reversal of 6420946559 is 9556490246.

It is a happy number.

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 6420946559 - 2⁸ = 6420946303 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 (6420946159) 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, 52630649 + ... + 52630770.

It is an arithmetic number, because the mean of its divisors is an integer number (1631552010).

Almost surely, 2^6420946559 is an apocalyptic number.

6420946559 is a deficient number, since it is larger than the sum of its proper divisors (105261481).

6420946559 is a wasteful number, since it uses less digits than its factorization.

6420946559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105261480.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The square root of 6420946559 is about 80130.8090499528. The cubic root of 6420946559 is about 1858.6588550541.

The spelling of 6420946559 in words is "six billion, four hundred twenty million, nine hundred forty-six thousand, five hundred fifty-nine".