664562485821 has 16 divisors (see below), whose sum is σ = 959038774400. Its totient is φ = 406906441920.

The previous prime is 664562485799. The next prime is 664562485837. The reversal of 664562485821 is 128584265466.

664562485821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664562485821 - 2⁵ = 664562485789 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 (664562485621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42806470 + ... + 42821991.

It is an arithmetic number, because the mean of its divisors is an integer number (59939923400).

Almost surely, 2^664562485821 is an apocalyptic number.

It is an amenable number.

664562485821 is a deficient number, since it is larger than the sum of its proper divisors (294476288579).

664562485821 is a wasteful number, since it uses less digits than its factorization.

664562485821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85628676.

The product of its digits is 22118400, while the sum is 57.

The spelling of 664562485821 in words is "six hundred sixty-four billion, five hundred sixty-two million, four hundred eighty-five thousand, eight hundred twenty-one".