6420859400685 has 32 divisors (see below), whose sum is σ = 10893208914432. Its totient is φ = 3218421785600.

The previous prime is 6420859400663. The next prime is 6420859400689. The reversal of 6420859400685 is 5860049580246.

It is a happy number.

6420859400685 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6420859400685 - 2¹⁴ = 6420859384301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420859400689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17781189 + ... + 18138698.

It is an arithmetic number, because the mean of its divisors is an integer number (340412778576).

Almost surely, 2^{6420859400685} is an apocalyptic number.

It is an amenable number.

6420859400685 is a deficient number, since it is larger than the sum of its proper divisors (4472349513747).

6420859400685 is a wasteful number, since it uses less digits than its factorization.

6420859400685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35920613.

The product of its (nonzero) digits is 16588800, while the sum is 57.

The spelling of 6420859400685 in words is "six trillion, four hundred twenty billion, eight hundred fifty-nine million, four hundred thousand, six hundred eighty-five".