642187875166 has 8 divisors (see below), whose sum is σ = 963299088144. Its totient is φ = 321088179120.

The previous prime is 642187875127. The next prime is 642187875227. The reversal of 642187875166 is 661578781246.

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

It is a congruent number.

It is an unprimeable number.

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, 2738455 + ... + 2963698.

It is an arithmetic number, because the mean of its divisors is an integer number (120412386018).

Almost surely, 2^642187875166 is an apocalyptic number.

642187875166 is a deficient number, since it is larger than the sum of its proper divisors (321111212978).

642187875166 is a wasteful number, since it uses less digits than its factorization.

642187875166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5758466.

The product of its digits is 27095040, while the sum is 61.

The spelling of 642187875166 in words is "six hundred forty-two billion, one hundred eighty-seven million, eight hundred seventy-five thousand, one hundred sixty-six".