6445463544 has 80 divisors (see below), whose sum is σ = 19442004120. Its totient is φ = 1983216960.

The previous prime is 6445463513. The next prime is 6445463551. The reversal of 6445463544 is 4453645446.

6445463544 is a `hidden beast` number, since 6 + 4 + 4 + 5 + 4 + 635 + 4 + 4 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6445463544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 374142 + ... + 390989.

Almost surely, 2^6445463544 is an apocalyptic number.

It is an amenable number.

6445463544 is an abundant number, since it is smaller than the sum of its proper divisors (12996540576).

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

6445463544 is a wasteful number, since it uses less digits than its factorization.

6445463544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765162 (or 765149 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 45.

The square root of 6445463544 is about 80283.6443119020. The cubic root of 6445463544 is about 1861.0214784619.

The spelling of 6445463544 in words is "six billion, four hundred forty-five million, four hundred sixty-three thousand, five hundred forty-four".