642668751518 has 8 divisors (see below), whose sum is σ = 987515398800. Its totient is φ = 313496951920.

The previous prime is 642668751511. The next prime is 642668751533. The reversal of 642668751518 is 815157866246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642668751511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3918711818 + ... + 3918711981.

It is an arithmetic number, because the mean of its divisors is an integer number (123439424850).

Almost surely, 2^642668751518 is an apocalyptic number.

642668751518 is a deficient number, since it is larger than the sum of its proper divisors (344846647282).

642668751518 is a wasteful number, since it uses less digits than its factorization.

642668751518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7837423842.

The product of its digits is 19353600, while the sum is 59.

The spelling of 642668751518 in words is "six hundred forty-two billion, six hundred sixty-eight million, seven hundred fifty-one thousand, five hundred eighteen".