642842668516 has 12 divisors (see below), whose sum is σ = 1152413076780. Its totient is φ = 313581789440.

The previous prime is 642842668499. The next prime is 642842668519. The reversal of 642842668516 is 615866248246.

It is a happy number.

642842668516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 17234438400 + 625608230116 = 131280^2 + 790954^2 .

It is not an unprimeable number, because it can be changed into a prime (642842668519) 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, 1959886021 + ... + 1959886348.

It is an arithmetic number, because the mean of its divisors is an integer number (96034423065).

Almost surely, 2^642842668516 is an apocalyptic number.

It is an amenable number.

642842668516 is a deficient number, since it is larger than the sum of its proper divisors (509570408264).

642842668516 is a wasteful number, since it uses less digits than its factorization.

642842668516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3919772414 (or 3919772412 counting only the distinct ones).

The product of its digits is 26542080, while the sum is 58.

The spelling of 642842668516 in words is "six hundred forty-two billion, eight hundred forty-two million, six hundred sixty-eight thousand, five hundred sixteen".