86178616821 has 20 divisors (see below), whose sum is σ = 140439228864. Its totient is φ = 52229464200.

The previous prime is 86178616757. The next prime is 86178616837. The reversal of 86178616821 is 12861687168.

It is a happy number.

86178616821 is a `hidden beast` number, since 8 + 6 + 17 + 8 + 616 + 8 + 2 + 1 = 666.

It is not a de Polignac number, because 86178616821 - 2⁶ = 86178616757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86178616841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48359725 + ... + 48361506.

Almost surely, 2^86178616821 is an apocalyptic number.

86178616821 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

86178616821 is a deficient number, since it is larger than the sum of its proper divisors (54260612043).

86178616821 is a wasteful number, since it uses less digits than its factorization.

86178616821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96721254 (or 96721245 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The spelling of 86178616821 in words is "eighty-six billion, one hundred seventy-eight million, six hundred sixteen thousand, eight hundred twenty-one".