642455634204 has 18 divisors (see below), whose sum is σ = 1623985075440. Its totient is φ = 214151878056.

The previous prime is 642455634199. The next prime is 642455634209. The reversal of 642455634204 is 402436554246.

It is a happy number.

642455634204 is a `hidden beast` number, since 6 + 4 + 2 + 4 + 5 + 5 + 634 + 2 + 0 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (642455634199) and next prime (642455634209).

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 642455634204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642455634209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8922994884 + ... + 8922994955.

It is an arithmetic number, because the mean of its divisors is an integer number (90221393080).

Almost surely, 2^642455634204 is an apocalyptic number.

It is an amenable number.

642455634204 is an abundant number, since it is smaller than the sum of its proper divisors (981529441236).

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

642455634204 is a wasteful number, since it uses less digits than its factorization.

642455634204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17845989849 (or 17845989844 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 45.

The spelling of 642455634204 in words is "six hundred forty-two billion, four hundred fifty-five million, six hundred thirty-four thousand, two hundred four".