6640783613 has 4 divisors (see below), whose sum is σ = 6990298560. Its totient is φ = 6291268668.

The previous prime is 6640783607. The next prime is 6640783663. The reversal of 6640783613 is 3163870466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6640783613 - 2¹⁴ = 6640767229 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 (6640783663) 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, 174757445 + ... + 174757482.

It is an arithmetic number, because the mean of its divisors is an integer number (1747574640).

Almost surely, 2^6640783613 is an apocalyptic number.

It is an amenable number.

6640783613 is a deficient number, since it is larger than the sum of its proper divisors (349514947).

6640783613 is a wasteful number, since it uses less digits than its factorization.

6640783613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349514946.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 6640783613 is about 81491.0032641641. The cubic root of 6640783613 is about 1879.6332101887.

The spelling of 6640783613 in words is "six billion, six hundred forty million, seven hundred eighty-three thousand, six hundred thirteen".