642011376623 has 4 divisors (see below), whose sum is σ = 642263049648. Its totient is φ = 641759703600.

The previous prime is 642011376571. The next prime is 642011376659. The reversal of 642011376623 is 326673110246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642011376623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642011376823) 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, 125832686 + ... + 125837787.

It is an arithmetic number, because the mean of its divisors is an integer number (160565762412).

Almost surely, 2^642011376623 is an apocalyptic number.

642011376623 is a deficient number, since it is larger than the sum of its proper divisors (251673025).

642011376623 is a wasteful number, since it uses less digits than its factorization.

642011376623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251673024.

The product of its (nonzero) digits is 217728, while the sum is 41.

Adding to 642011376623 its reverse (326673110246), we get a palindrome (968684486869).

The spelling of 642011376623 in words is "six hundred forty-two billion, eleven million, three hundred seventy-six thousand, six hundred twenty-three".