6420853660 has 24 divisors (see below), whose sum is σ = 14521008096. Its totient is φ = 2370776640.

The previous prime is 6420853657. The next prime is 6420853669. The reversal of 6420853660 is 663580246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420853669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12347536 + ... + 12348055.

It is an arithmetic number, because the mean of its divisors is an integer number (605042004).

Almost surely, 2^6420853660 is an apocalyptic number.

It is an amenable number.

6420853660 is an abundant number, since it is smaller than the sum of its proper divisors (8100154436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6420853660 is a wasteful number, since it uses less digits than its factorization.

6420853660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24695613 (or 24695611 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 6420853660 is about 80130.2293769336. The cubic root of 6420853660 is about 1858.6498912468.

The spelling of 6420853660 in words is "six billion, four hundred twenty million, eight hundred fifty-three thousand, six hundred sixty".