642657516606 has 48 divisors (see below), whose sum is σ = 1628350399104. Its totient is φ = 179346282192.

The previous prime is 642657516587. The next prime is 642657516617. The reversal of 642657516606 is 606615756246.

642657516606 is a `hidden beast` number, since 6 + 4 + 2 + 6 + 575 + 1 + 6 + 60 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59302216 + ... + 59313051.

It is an arithmetic number, because the mean of its divisors is an integer number (33923966648).

Almost surely, 2^642657516606 is an apocalyptic number.

642657516606 is an abundant number, since it is smaller than the sum of its proper divisors (985692882498).

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

642657516606 is a wasteful number, since it uses less digits than its factorization.

642657516606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118615325 (or 118615322 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 642657516606 in words is "six hundred forty-two billion, six hundred fifty-seven million, five hundred sixteen thousand, six hundred six".