6415646638 has 16 divisors (see below), whose sum is σ = 9658258560. Its totient is φ = 3196242616.

The previous prime is 6415646623. The next prime is 6415646641. The reversal of 6415646638 is 8366465146.

It is a junction number, because it is equal to n+sod(n) for n = 6415646591 and 6415646600.

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, 1090581 + ... + 1096447.

It is an arithmetic number, because the mean of its divisors is an integer number (603641160).

Almost surely, 2^6415646638 is an apocalyptic number.

6415646638 is a deficient number, since it is larger than the sum of its proper divisors (3242611922).

6415646638 is a wasteful number, since it uses less digits than its factorization.

6415646638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7751.

The product of its digits is 2488320, while the sum is 49.

The square root of 6415646638 is about 80097.7317906069. The cubic root of 6415646638 is about 1858.1473283627.

The spelling of 6415646638 in words is "six billion, four hundred fifteen million, six hundred forty-six thousand, six hundred thirty-eight".