642644606361 has 16 divisors (see below), whose sum is σ = 862168837184. Its totient is φ = 425775377664.

The previous prime is 642644606353. The next prime is 642644606407. The reversal of 642644606361 is 163606446246.

642644606361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642644606361 - 2³ = 642644606353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 642644606361.

It is not an unprimeable number, because it can be changed into a prime (642644604361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11226765 + ... + 11283861.

It is an arithmetic number, because the mean of its divisors is an integer number (53885552324).

Almost surely, 2^642644606361 is an apocalyptic number.

It is an amenable number.

642644606361 is a deficient number, since it is larger than the sum of its proper divisors (219524230823).

642644606361 is a wasteful number, since it uses less digits than its factorization.

642644606361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80280.

The product of its (nonzero) digits is 2985984, while the sum is 48.

The spelling of 642644606361 in words is "six hundred forty-two billion, six hundred forty-four million, six hundred six thousand, three hundred sixty-one".