6446505686 has 32 divisors (see below), whose sum is σ = 10023773760. Its totient is φ = 3107289600.

The previous prime is 6446505683. The next prime is 6446505697. The reversal of 6446505686 is 6865056446.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446505683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4352066 + ... + 4353546.

It is an arithmetic number, because the mean of its divisors is an integer number (313242930).

Almost surely, 2^6446505686 is an apocalyptic number.

6446505686 is a deficient number, since it is larger than the sum of its proper divisors (3577268074).

6446505686 is a wasteful number, since it uses less digits than its factorization.

6446505686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 4147200, while the sum is 50.

The square root of 6446505686 is about 80290.1344250961. The cubic root of 6446505686 is about 1861.1217735048.

The spelling of 6446505686 in words is "six billion, four hundred forty-six million, five hundred five thousand, six hundred eighty-six".