6420944855 has 8 divisors (see below), whose sum is σ = 8297836512. Its totient is φ = 4741620768.

The previous prime is 6420944801. The next prime is 6420944879. The reversal of 6420944855 is 5584490246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6420944855 - 2¹² = 6420940759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49391819 + ... + 49391948.

It is an arithmetic number, because the mean of its divisors is an integer number (1037229564).

Almost surely, 2^6420944855 is an apocalyptic number.

6420944855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6420944855 is a deficient number, since it is larger than the sum of its proper divisors (1876891657).

6420944855 is a wasteful number, since it uses less digits than its factorization.

6420944855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98783785.

The product of its (nonzero) digits is 1382400, while the sum is 47.

The square root of 6420944855 is about 80130.7984173376. The cubic root of 6420944855 is about 1858.6586906362.

The spelling of 6420944855 in words is "six billion, four hundred twenty million, nine hundred forty-four thousand, eight hundred fifty-five".