642635563350 has 96 divisors (see below), whose sum is σ = 1755835833600. Its totient is φ = 154247920000.

The previous prime is 642635563259. The next prime is 642635563351. The reversal of 642635563350 is 53365536246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642635563350.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642635563351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1761450 + ... + 2094749.

It is an arithmetic number, because the mean of its divisors is an integer number (18289956600).

Almost surely, 2^642635563350 is an apocalyptic number.

642635563350 is an abundant number, since it is smaller than the sum of its proper divisors (1113200270250).

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

642635563350 is a wasteful number, since it uses less digits than its factorization.

642635563350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856326 (or 3856321 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 48.

The spelling of 642635563350 in words is "six hundred forty-two billion, six hundred thirty-five million, five hundred sixty-three thousand, three hundred fifty".