86978788387617 has 24 divisors (see below), whose sum is σ = 134914454161536. Its totient is φ = 49699004368608.

The previous prime is 86978788387597. The next prime is 86978788387627. The reversal of 86978788387617 is 71678388787968.

It is not a de Polignac number, because 86978788387617 - 2⁷ = 86978788387489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86978788387627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16491433 + ... + 21116934.

It is an arithmetic number, because the mean of its divisors is an integer number (5621435590064).

Almost surely, 2^{86978788387617} is an apocalyptic number.

It is an amenable number.

86978788387617 is a deficient number, since it is larger than the sum of its proper divisors (47935665773919).

86978788387617 is a wasteful number, since it uses less digits than its factorization.

86978788387617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37624117 (or 37624110 counting only the distinct ones).

The product of its digits is 76473040896, while the sum is 93.

The spelling of 86978788387617 in words is "eighty-six trillion, nine hundred seventy-eight billion, seven hundred eighty-eight million, three hundred eighty-seven thousand, six hundred seventeen".