8121871514642 has 8 divisors (see below), whose sum is σ = 12244648933836. Its totient is φ = 4040321870032.

The previous prime is 8121871514569. The next prime is 8121871514663. The reversal of 8121871514642 is 2464151781218.

It can be written as a sum of positive squares in 2 ways, for example, as 8075946596041 + 45924918601 = 2841821^2 + 214301^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10306943153 + ... + 10306943940.

Almost surely, 2^{8121871514642} is an apocalyptic number.

8121871514642 is a deficient number, since it is larger than the sum of its proper divisors (4122777419194).

8121871514642 is a wasteful number, since it uses less digits than its factorization.

8121871514642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20613887292.

The product of its digits is 860160, while the sum is 50.

The spelling of 8121871514642 in words is "eight trillion, one hundred twenty-one billion, eight hundred seventy-one million, five hundred fourteen thousand, six hundred forty-two".