6640143373 has 4 divisors (see below), whose sum is σ = 7030740060. Its totient is φ = 6249546688.

The previous prime is 6640143371. The next prime is 6640143421. The reversal of 6640143373 is 3733410466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6209912809 + 430230564 = 78803^2 + 20742^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640143373 - 2¹ = 6640143371 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 (6640143371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195298318 + ... + 195298351.

It is an arithmetic number, because the mean of its divisors is an integer number (1757685015).

Almost surely, 2^6640143373 is an apocalyptic number.

It is an amenable number.

6640143373 is a deficient number, since it is larger than the sum of its proper divisors (390596687).

6640143373 is a wasteful number, since it uses less digits than its factorization.

6640143373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390596686.

The product of its (nonzero) digits is 108864, while the sum is 37.

The square root of 6640143373 is about 81487.0748830758. The cubic root of 6640143373 is about 1879.5728029079.

The spelling of 6640143373 in words is "six billion, six hundred forty million, one hundred forty-three thousand, three hundred seventy-three".