86708578897921 has 4 divisors (see below), whose sum is σ = 89505629830144. Its totient is φ = 83911527965700.

The previous prime is 86708578897879. The next prime is 86708578897951. The reversal of 86708578897921 is 12979887580768.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86708578897921 - 2³⁷ = 86571139944449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86708578897951) 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, 1398525466065 + ... + 1398525466126.

It is an arithmetic number, because the mean of its divisors is an integer number (22376407457536).

Almost surely, 2^{86708578897921} is an apocalyptic number.

It is an amenable number.

86708578897921 is a deficient number, since it is larger than the sum of its proper divisors (2797050932223).

86708578897921 is a wasteful number, since it uses less digits than its factorization.

86708578897921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797050932222.

The product of its (nonzero) digits is 6827950080, while the sum is 85.

The spelling of 86708578897921 in words is "eighty-six trillion, seven hundred eight billion, five hundred seventy-eight million, eight hundred ninety-seven thousand, nine hundred twenty-one".