642600121113 has 6 divisors (see below), whose sum is σ = 928200174954. Its totient is φ = 428400080736.

The previous prime is 642600121103. The next prime is 642600121127. The reversal of 642600121113 is 311121006246.

It is a happy number.

642600121113 is a `hidden beast` number, since 6 + 42 + 600 + 1 + 2 + 1 + 1 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 637996770009 + 4603351104 = 798747^2 + 67848^2 .

It is not a de Polignac number, because 642600121113 - 2⁸ = 642600120857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642600121103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35700006720 + ... + 35700006737.

It is an arithmetic number, because the mean of its divisors is an integer number (154700029159).

Almost surely, 2^642600121113 is an apocalyptic number.

It is an amenable number.

642600121113 is a deficient number, since it is larger than the sum of its proper divisors (285600053841).

642600121113 is a wasteful number, since it uses less digits than its factorization.

642600121113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71400013463 (or 71400013460 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 642600121113 its reverse (311121006246), we get a palindrome (953721127359).

The spelling of 642600121113 in words is "six hundred forty-two billion, six hundred million, one hundred twenty-one thousand, one hundred thirteen".