642623351052 has 12 divisors (see below), whose sum is σ = 1499454485816. Its totient is φ = 214207783680.

The previous prime is 642623351021. The next prime is 642623351059. The reversal of 642623351052 is 250153326246.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 642623351052.

It is not an unprimeable number, because it can be changed into a prime (642623351059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26775972949 + ... + 26775972972.

Almost surely, 2^642623351052 is an apocalyptic number.

It is an amenable number.

642623351052 is an abundant number, since it is smaller than the sum of its proper divisors (856831134764).

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

642623351052 is a wasteful number, since it uses less digits than its factorization.

642623351052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53551945928 (or 53551945926 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 642623351052 its reverse (250153326246), we get a palindrome (892776677298).

The spelling of 642623351052 in words is "six hundred forty-two billion, six hundred twenty-three million, three hundred fifty-one thousand, fifty-two".