87121838965 has 16 divisors (see below), whose sum is σ = 120664368000. Its totient is φ = 59149195200.

The previous prime is 87121838939. The next prime is 87121839011. The reversal of 87121838965 is 56983812178.

It is not a de Polignac number, because 87121838965 - 2¹³ = 87121830773 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 12319215 + ... + 12326284.

It is an arithmetic number, because the mean of its divisors is an integer number (7541523000).

Almost surely, 2^87121838965 is an apocalyptic number.

It is an amenable number.

87121838965 is a deficient number, since it is larger than the sum of its proper divisors (33542529035).

87121838965 is a wasteful number, since it uses less digits than its factorization.

87121838965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24645612.

The product of its digits is 5806080, while the sum is 58.

The spelling of 87121838965 in words is "eighty-seven billion, one hundred twenty-one million, eight hundred thirty-eight thousand, nine hundred sixty-five".