642342433655450 has 96 divisors (see below), whose sum is σ = 1315720489659840. Its totient is φ = 231367207680000.

The previous prime is 642342433655441. The next prime is 642342433655467. The reversal of 642342433655450 is 54556334243246.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 199897985 + ... + 203085915.

It is an arithmetic number, because the mean of its divisors is an integer number (13705421767290).

Almost surely, 2^{642342433655450} is an apocalyptic number.

642342433655450 is an abundant number, since it is smaller than the sum of its proper divisors (673378056004390).

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

642342433655450 is a wasteful number, since it uses less digits than its factorization.

642342433655450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191424 (or 3191419 counting only the distinct ones).

The product of its (nonzero) digits is 124416000, while the sum is 56.

Adding to 642342433655450 its reverse (54556334243246), we get a palindrome (696898767898696).

The spelling of 642342433655450 in words is "six hundred forty-two trillion, three hundred forty-two billion, four hundred thirty-three million, six hundred fifty-five thousand, four hundred fifty".