786557448161 has 2 divisors, whose sum is σ = 786557448162. Its totient is φ = 786557448160.

The previous prime is 786557448143. The next prime is 786557448169. The reversal of 786557448161 is 161844755687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433773718225 + 352783729936 = 658615^2 + 593956^2 .

It is a cyclic number.

It is not a de Polignac number, because 786557448161 - 2¹⁸ = 786557186017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 786557448094 and 786557448103.

It is not a weakly prime, because it can be changed into another prime (786557448169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393278724080 + 393278724081.

It is an arithmetic number, because the mean of its divisors is an integer number (393278724081).

Almost surely, 2^786557448161 is an apocalyptic number.

It is an amenable number.

786557448161 is a deficient number, since it is larger than the sum of its proper divisors (1).

786557448161 is an equidigital number, since it uses as much as digits as its factorization.

786557448161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45158400, while the sum is 62.

The spelling of 786557448161 in words is "seven hundred eighty-six billion, five hundred fifty-seven million, four hundred forty-eight thousand, one hundred sixty-one".