6640204664642 has 16 divisors (see below), whose sum is σ = 10192040450592. Its totient is φ = 3242859338880.

The previous prime is 6640204664593. The next prime is 6640204664657. The reversal of 6640204664642 is 2464664020466.

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, 10378418 + ... + 10999634.

It is an arithmetic number, because the mean of its divisors is an integer number (637002528162).

Almost surely, 2^{6640204664642} is an apocalyptic number.

6640204664642 is a deficient number, since it is larger than the sum of its proper divisors (3551835785950).

6640204664642 is a wasteful number, since it uses less digits than its factorization.

6640204664642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745553.

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 6640204664642 in words is "six trillion, six hundred forty billion, two hundred four million, six hundred sixty-four thousand, six hundred forty-two".