64493640873 has 6 divisors (see below), whose sum is σ = 93157481274. Its totient is φ = 42995760576.

The previous prime is 64493640857. The next prime is 64493640881. The reversal of 64493640873 is 37804639446.

64493640873 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., 55437644304 + 9055996569 = 235452^2 + 95163^2 .

It is not a de Polignac number, because 64493640873 - 2⁴ = 64493640857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64493640833) 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, 3582980040 + ... + 3582980057.

It is an arithmetic number, because the mean of its divisors is an integer number (15526246879).

Almost surely, 2^64493640873 is an apocalyptic number.

It is an amenable number.

64493640873 is a deficient number, since it is larger than the sum of its proper divisors (28663840401).

64493640873 is a wasteful number, since it uses less digits than its factorization.

64493640873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7165960103 (or 7165960100 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 54.

The spelling of 64493640873 in words is "sixty-four billion, four hundred ninety-three million, six hundred forty thousand, eight hundred seventy-three".