86638518797 has 2 divisors, whose sum is σ = 86638518798. Its totient is φ = 86638518796.

The previous prime is 86638518773. The next prime is 86638518853. The reversal of 86638518797 is 79781583668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48342377161 + 38296141636 = 219869^2 + 195694^2 .

It is a cyclic number.

It is not a de Polignac number, because 86638518797 - 2⁸ = 86638518541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86638518097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43319259398 + 43319259399.

It is an arithmetic number, because the mean of its divisors is an integer number (43319259399).

Almost surely, 2^86638518797 is an apocalyptic number.

It is an amenable number.

86638518797 is a deficient number, since it is larger than the sum of its proper divisors (1).

86638518797 is an equidigital number, since it uses as much as digits as its factorization.

86638518797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121927680, while the sum is 68.

The spelling of 86638518797 in words is "eighty-six billion, six hundred thirty-eight million, five hundred eighteen thousand, seven hundred ninety-seven".