86781418769 has 4 divisors (see below), whose sum is σ = 87756490980. Its totient is φ = 85806346560.

The previous prime is 86781418751. The next prime is 86781418813. The reversal of 86781418769 is 96781418768.

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 6359265025 + 80422153744 = 79745^2 + 283588^2 .

It is a cyclic number.

It is not a de Polignac number, because 86781418769 - 2¹⁶ = 86781353233 is a prime.

It is a super-3 number, since 3×86781418769³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86781418739) 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, 487535972 + ... + 487536149.

It is an arithmetic number, because the mean of its divisors is an integer number (21939122745).

Almost surely, 2^86781418769 is an apocalyptic number.

86781418769 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

86781418769 is a deficient number, since it is larger than the sum of its proper divisors (975072211).

86781418769 is an equidigital number, since it uses as much as digits as its factorization.

86781418769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975072210.

The product of its digits is 32514048, while the sum is 65.

Subtracting 86781418769 from its reverse (96781418768), we obtain a palindrome (9999999999).

The spelling of 86781418769 in words is "eighty-six billion, seven hundred eighty-one million, four hundred eighteen thousand, seven hundred sixty-nine".