6640713620 has 12 divisors (see below), whose sum is σ = 13945498644. Its totient is φ = 2656285440.

The previous prime is 6640713533. The next prime is 6640713679. The reversal of 6640713620 is 263170466.

It can be written as a sum of positive squares in 2 ways, for example, as 2018345476 + 4622368144 = 44926^2 + 67988^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166017821 + ... + 166017860.

It is an arithmetic number, because the mean of its divisors is an integer number (1162124887).

Almost surely, 2^6640713620 is an apocalyptic number.

It is an amenable number.

6640713620 is an abundant number, since it is smaller than the sum of its proper divisors (7304785024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6640713620 is a wasteful number, since it uses less digits than its factorization.

6640713620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332035690 (or 332035688 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 6640713620 is about 81490.5738107175. The cubic root of 6640713620 is about 1879.6266064686.

The spelling of 6640713620 in words is "six billion, six hundred forty million, seven hundred thirteen thousand, six hundred twenty".