86871956669 has 2 divisors, whose sum is σ = 86871956670. Its totient is φ = 86871956668.

The previous prime is 86871956653. The next prime is 86871956681. The reversal of 86871956669 is 96665917868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84586160569 + 2285796100 = 290837^2 + 47810^2 .

It is a cyclic number.

It is not a de Polignac number, because 86871956669 - 2⁴ = 86871956653 is a prime.

It is a super-2 number, since 2×86871956669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86871956629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43435978334 + 43435978335.

It is an arithmetic number, because the mean of its divisors is an integer number (43435978335).

Almost surely, 2^86871956669 is an apocalyptic number.

It is an amenable number.

86871956669 is a deficient number, since it is larger than the sum of its proper divisors (1).

86871956669 is an equidigital number, since it uses as much as digits as its factorization.

86871956669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 235146240, while the sum is 71.

The spelling of 86871956669 in words is "eighty-six billion, eight hundred seventy-one million, nine hundred fifty-six thousand, six hundred sixty-nine".