642124041620 has 24 divisors (see below), whose sum is σ = 1348931932488. Its totient is φ = 256759817600.

The previous prime is 642124041617. The next prime is 642124041641. The reversal of 642124041620 is 26140421246.

It can be written as a sum of positive squares in 4 ways, for example, as 2997343504 + 639126698116 = 54748^2 + 799454^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5553791 + ... + 5668230.

It is an arithmetic number, because the mean of its divisors is an integer number (56205497187).

Almost surely, 2^642124041620 is an apocalyptic number.

It is an amenable number.

642124041620 is an abundant number, since it is smaller than the sum of its proper divisors (706807890868).

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

642124041620 is a wasteful number, since it uses less digits than its factorization.

642124041620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224891 (or 11224889 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 642124041620 its reverse (26140421246), we get a palindrome (668264462866).

The spelling of 642124041620 in words is "six hundred forty-two billion, one hundred twenty-four million, forty-one thousand, six hundred twenty".