6645504575 has 24 divisors (see below), whose sum is σ = 8396020656. Its totient is φ = 5216960000.

The previous prime is 6645504553. The next prime is 6645504583. The reversal of 6645504575 is 5754055466.

It is not a de Polignac number, because 6645504575 - 2¹⁸ = 6645242431 is a prime.

It is a Duffinian number.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 273680 + ... + 296970.

It is an arithmetic number, because the mean of its divisors is an integer number (349834194).

Almost surely, 2^6645504575 is an apocalyptic number.

6645504575 is a deficient number, since it is larger than the sum of its proper divisors (1750516081).

6645504575 is a wasteful number, since it uses less digits than its factorization.

6645504575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23515 (or 23510 counting only the distinct ones).

The product of its (nonzero) digits is 2520000, while the sum is 47.

The square root of 6645504575 is about 81519.9642725633. The cubic root of 6645504575 is about 1880.0785178275.

The spelling of 6645504575 in words is "six billion, six hundred forty-five million, five hundred four thousand, five hundred seventy-five".