6640514786 has 16 divisors (see below), whose sum is σ = 10131348480. Its totient is φ = 3263878800.

The previous prime is 6640514747. The next prime is 6640514791. The reversal of 6640514786 is 6874150466.

It is a self number, because there is not a number n which added to its sum of digits gives 6640514786.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92240 + ... + 147611.

It is an arithmetic number, because the mean of its divisors is an integer number (633209280).

Almost surely, 2^6640514786 is an apocalyptic number.

6640514786 is a deficient number, since it is larger than the sum of its proper divisors (3490833694).

6640514786 is a wasteful number, since it uses less digits than its factorization.

6640514786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240089.

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 6640514786 is about 81489.3538199930. The cubic root of 6640514786 is about 1879.6078465668.

The spelling of 6640514786 in words is "six billion, six hundred forty million, five hundred fourteen thousand, seven hundred eighty-six".