86921780629 has 2 divisors, whose sum is σ = 86921780630. Its totient is φ = 86921780628.

The previous prime is 86921780599. The next prime is 86921780653. The reversal of 86921780629 is 92608712968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86921780625 + 4 = 294825^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 86921780629 - 2⁹ = 86921780117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86921780689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43460890314 + 43460890315.

It is an arithmetic number, because the mean of its divisors is an integer number (43460890315).

Almost surely, 2^86921780629 is an apocalyptic number.

It is an amenable number.

86921780629 is a deficient number, since it is larger than the sum of its proper divisors (1).

86921780629 is an equidigital number, since it uses as much as digits as its factorization.

86921780629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The spelling of 86921780629 in words is "eighty-six billion, nine hundred twenty-one million, seven hundred eighty thousand, six hundred twenty-nine".