6639064373 has 2 divisors, whose sum is σ = 6639064374. Its totient is φ = 6639064372.

The previous prime is 6639064363. The next prime is 6639064387. The reversal of 6639064373 is 3734609366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6632799364 + 6265009 = 81442^2 + 2503^2 .

It is a cyclic number.

It is not a de Polignac number, because 6639064373 - 2⁴ = 6639064357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6639064363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319532186 + 3319532187.

It is an arithmetic number, because the mean of its divisors is an integer number (3319532187).

Almost surely, 2^6639064373 is an apocalyptic number.

It is an amenable number.

6639064373 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639064373 is an equidigital number, since it uses as much as digits as its factorization.

6639064373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 47.

The square root of 6639064373 is about 81480.4539322162. The cubic root of 6639064373 is about 1879.4709893977.

The spelling of 6639064373 in words is "six billion, six hundred thirty-nine million, sixty-four thousand, three hundred seventy-three".