86172513793 has 2 divisors, whose sum is σ = 86172513794. Its totient is φ = 86172513792.

The previous prime is 86172513769. The next prime is 86172513799. The reversal of 86172513793 is 39731527168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84671106289 + 1501407504 = 290983^2 + 38748^2 .

It is a cyclic number.

It is not a de Polignac number, because 86172513793 - 2¹⁷ = 86172382721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86172513793.

It is not a weakly prime, because it can be changed into another prime (86172513799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43086256896 + 43086256897.

It is an arithmetic number, because the mean of its divisors is an integer number (43086256897).

Almost surely, 2^86172513793 is an apocalyptic number.

It is an amenable number.

86172513793 is a deficient number, since it is larger than the sum of its proper divisors (1).

86172513793 is an equidigital number, since it uses as much as digits as its factorization.

86172513793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 52.

The spelling of 86172513793 in words is "eighty-six billion, one hundred seventy-two million, five hundred thirteen thousand, seven hundred ninety-three".