6445581506 has 32 divisors (see below), whose sum is σ = 11912116608. Its totient is φ = 2547204480.

The previous prime is 6445581497. The next prime is 6445581509. The reversal of 6445581506 is 6051855446.

It is not an unprimeable number, because it can be changed into a prime (6445581509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158486 + ... + 194958.

It is an arithmetic number, because the mean of its divisors is an integer number (372253644).

Almost surely, 2^6445581506 is an apocalyptic number.

6445581506 is a deficient number, since it is larger than the sum of its proper divisors (5466535102).

6445581506 is a wasteful number, since it uses less digits than its factorization.

6445581506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37466.

The product of its (nonzero) digits is 576000, while the sum is 44.

The square root of 6445581506 is about 80284.3789662721. The cubic root of 6445581506 is about 1861.0328315878.

The spelling of 6445581506 in words is "six billion, four hundred forty-five million, five hundred eighty-one thousand, five hundred six".