786784078081 has 6 divisors (see below), whose sum is σ = 812982924546. Its totient is φ = 761403945600.

The previous prime is 786784078057. The next prime is 786784078109. The reversal of 786784078081 is 180870487687.

It can be written as a sum of positive squares in only one way, i.e., 748641988081 + 38142090000 = 865241^2 + 195300^2 .

It is not a de Polignac number, because 786784078081 - 2³⁵ = 752424339713 is a prime.

It is a super-2 number, since 2×786784078081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (786784075081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409356000 + ... + 409357921.

It is an arithmetic number, because the mean of its divisors is an integer number (135497154091).

Almost surely, 2^786784078081 is an apocalyptic number.

It is an amenable number.

786784078081 is a deficient number, since it is larger than the sum of its proper divisors (26198846465).

786784078081 is an equidigital number, since it uses as much as digits as its factorization.

786784078081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818713983 (or 818713952 counting only the distinct ones).

The product of its (nonzero) digits is 33718272, while the sum is 64.

The spelling of 786784078081 in words is "seven hundred eighty-six billion, seven hundred eighty-four million, seventy-eight thousand, eighty-one".