6445465520 has 40 divisors (see below), whose sum is σ = 16138456656. Its totient is φ = 2379863808.

The previous prime is 6445465489. The next prime is 6445465541. The reversal of 6445465520 is 255645446.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3097742 + ... + 3099821.

Almost surely, 2^6445465520 is an apocalyptic number.

It is an amenable number.

6445465520 is an abundant number, since it is smaller than the sum of its proper divisors (9692991136).

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

6445465520 is a wasteful number, since it uses less digits than its factorization.

6445465520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6197589 (or 6197583 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 41.

The square root of 6445465520 is about 80283.6566182682. The cubic root of 6445465520 is about 1861.0216686410.

The spelling of 6445465520 in words is "six billion, four hundred forty-five million, four hundred sixty-five thousand, five hundred twenty".