86721115913 has 8 divisors (see below), whose sum is σ = 87096942408. Its totient is φ = 86345933184.

The previous prime is 86721115861. The next prime is 86721115937. The reversal of 86721115913 is 31951112768.

It can be written as a sum of positive squares in 4 ways, for example, as 18201247744 + 68519868169 = 134912^2 + 261763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86721115913 - 2⁶ = 86721115849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86721115973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110045 + ... + 430757.

It is an arithmetic number, because the mean of its divisors is an integer number (10887117801).

Almost surely, 2^86721115913 is an apocalyptic number.

It is an amenable number.

86721115913 is a deficient number, since it is larger than the sum of its proper divisors (375826495).

86721115913 is a wasteful number, since it uses less digits than its factorization.

86721115913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321883.

The product of its digits is 90720, while the sum is 44.

The spelling of 86721115913 in words is "eighty-six billion, seven hundred twenty-one million, one hundred fifteen thousand, nine hundred thirteen".