64873560321 has 6 divisors (see below), whose sum is σ = 93706253810. Its totient is φ = 43249040208.

The previous prime is 64873560313. The next prime is 64873560331. The reversal of 64873560321 is 12306537846.

64873560321 is a `hidden beast` number, since 6 + 4 + 8 + 7 + 35 + 603 + 2 + 1 = 666.

64873560321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 64810976400 + 62583921 = 254580^2 + 7911^2 .

It is not a de Polignac number, because 64873560321 - 2³ = 64873560313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64873560331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3604086676 + ... + 3604086693.

Almost surely, 2^64873560321 is an apocalyptic number.

It is an amenable number.

64873560321 is a deficient number, since it is larger than the sum of its proper divisors (28832693489).

64873560321 is a wasteful number, since it uses less digits than its factorization.

64873560321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7208173375 (or 7208173372 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 64873560321 in words is "sixty-four billion, eight hundred seventy-three million, five hundred sixty thousand, three hundred twenty-one".