6640788193 has 8 divisors (see below), whose sum is σ = 7153556648. Its totient is φ = 6128296704.

The previous prime is 6640788191. The next prime is 6640788199. The reversal of 6640788193 is 3918870466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 364504464 + 6276283729 = 19092^2 + 79223^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6640788193 - 2¹ = 6640788191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6640788193.

It is not an unprimeable number, because it can be changed into a prime (6640788191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18030 + ... + 116647.

It is an arithmetic number, because the mean of its divisors is an integer number (894194581).

Almost surely, 2^6640788193 is an apocalyptic number.

It is an amenable number.

6640788193 is a deficient number, since it is larger than the sum of its proper divisors (512768455).

6640788193 is a wasteful number, since it uses less digits than its factorization.

6640788193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138483.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 6640788193 is about 81491.0313654208. The cubic root of 6640788193 is about 1879.6336423023.

The spelling of 6640788193 in words is "six billion, six hundred forty million, seven hundred eighty-eight thousand, one hundred ninety-three".