86691513673 has 2 divisors, whose sum is σ = 86691513674. Its totient is φ = 86691513672.

The previous prime is 86691513599. The next prime is 86691513691. The reversal of 86691513673 is 37631519668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83621023929 + 3070489744 = 289173^2 + 55412^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86691513673 is a prime.

It is not a weakly prime, because it can be changed into another prime (86691513173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43345756836 + 43345756837.

It is an arithmetic number, because the mean of its divisors is an integer number (43345756837).

Almost surely, 2^86691513673 is an apocalyptic number.

It is an amenable number.

86691513673 is a deficient number, since it is larger than the sum of its proper divisors (1).

86691513673 is an equidigital number, since it uses as much as digits as its factorization.

86691513673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 55.

The spelling of 86691513673 in words is "eighty-six billion, six hundred ninety-one million, five hundred thirteen thousand, six hundred seventy-three".