86879920517 has 4 divisors (see below), whose sum is σ = 93562991340. Its totient is φ = 80196849696.

The previous prime is 86879920513. The next prime is 86879920529. The reversal of 86879920517 is 71502997868.

It is a Cunningham number, because it is equal to 294754²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12851849956 + 74028070561 = 113366^2 + 272081^2 .

It is a cyclic number.

It is not a de Polignac number, because 86879920517 - 2² = 86879920513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86879920517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86879920513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3341535392 + ... + 3341535417.

It is an arithmetic number, because the mean of its divisors is an integer number (23390747835).

Almost surely, 2^86879920517 is an apocalyptic number.

It is an amenable number.

86879920517 is a deficient number, since it is larger than the sum of its proper divisors (6683070823).

86879920517 is a wasteful number, since it uses less digits than its factorization.

86879920517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6683070822.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 86879920517 in words is "eighty-six billion, eight hundred seventy-nine million, nine hundred twenty thousand, five hundred seventeen".