6447421698 has 16 divisors (see below), whose sum is σ = 13138142976. Its totient is φ = 2108590640.

The previous prime is 6447421697. The next prime is 6447421699. The reversal of 6447421698 is 8961247446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6447421697) and next prime (6447421699).

It is a self number, because there is not a number n which added to its sum of digits gives 6447421698.

It is not an unprimeable number, because it can be changed into a prime (6447421691) 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, 10137138 + ... + 10137773.

It is an arithmetic number, because the mean of its divisors is an integer number (821133936).

Almost surely, 2^6447421698 is an apocalyptic number.

6447421698 is an abundant number, since it is smaller than the sum of its proper divisors (6690721278).

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

6447421698 is a wasteful number, since it uses less digits than its factorization.

6447421698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20274969.

The product of its digits is 2322432, while the sum is 51.

The square root of 6447421698 is about 80295.8386094821. The cubic root of 6447421698 is about 1861.2099209560.

The spelling of 6447421698 in words is "six billion, four hundred forty-seven million, four hundred twenty-one thousand, six hundred ninety-eight".