86172443969 has 2 divisors, whose sum is σ = 86172443970. Its totient is φ = 86172443968.

The previous prime is 86172443963. The next prime is 86172443989. The reversal of 86172443969 is 96934427168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82175675569 + 3996768400 = 286663^2 + 63220^2 .

It is a cyclic number.

It is not a de Polignac number, because 86172443969 - 2⁸ = 86172443713 is a prime.

It is a super-2 number, since 2×86172443969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86172443963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43086221984 + 43086221985.

It is an arithmetic number, because the mean of its divisors is an integer number (43086221985).

Almost surely, 2^86172443969 is an apocalyptic number.

It is an amenable number.

86172443969 is a deficient number, since it is larger than the sum of its proper divisors (1).

86172443969 is an equidigital number, since it uses as much as digits as its factorization.

86172443969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 59.

The spelling of 86172443969 in words is "eighty-six billion, one hundred seventy-two million, four hundred forty-three thousand, nine hundred sixty-nine".