642012353123 has 4 divisors (see below), whose sum is σ = 642017154768. Its totient is φ = 642007551480.

The previous prime is 642012353119. The next prime is 642012353237. The reversal of 642012353123 is 321353210246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321353210246 = 2 ⋅160676605123.

It is a cyclic number.

It is not a de Polignac number, because 642012353123 - 2² = 642012353119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642012353123.

It is not an unprimeable number, because it can be changed into a prime (642012353623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194343 + ... + 2469648.

It is an arithmetic number, because the mean of its divisors is an integer number (160504288692).

Almost surely, 2^642012353123 is an apocalyptic number.

642012353123 is a deficient number, since it is larger than the sum of its proper divisors (4801645).

642012353123 is a wasteful number, since it uses less digits than its factorization.

642012353123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801644.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 642012353123 its reverse (321353210246), we get a palindrome (963365563369).

The spelling of 642012353123 in words is "six hundred forty-two billion, twelve million, three hundred fifty-three thousand, one hundred twenty-three".