64445082509 has 16 divisors (see below), whose sum is σ = 65984274432. Its totient is φ = 62918663808.

The previous prime is 64445082503. The next prime is 64445082571. The reversal of 64445082509 is 90528054446.

It is a cyclic number.

It is not a de Polignac number, because 64445082509 - 2²⁸ = 64176647053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64445082503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9395009 + ... + 9401865.

It is an arithmetic number, because the mean of its divisors is an integer number (4124017152).

Almost surely, 2^64445082509 is an apocalyptic number.

It is an amenable number.

64445082509 is a deficient number, since it is larger than the sum of its proper divisors (1539191923).

64445082509 is a wasteful number, since it uses less digits than its factorization.

64445082509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756.

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 64445082509 in words is "sixty-four billion, four hundred forty-five million, eighty-two thousand, five hundred nine".