78286885569 has 6 divisors (see below), whose sum is σ = 113081056946. Its totient is φ = 52191257040.

The previous prime is 78286885529. The next prime is 78286885627. The reversal of 78286885569 is 96558868287.

78286885569 is a `hidden beast` number, since 7 + 8 + 2 + 8 + 68 + 8 + 556 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63375545025 + 14911340544 = 251745^2 + 122112^2 .

It is not a de Polignac number, because 78286885569 - 2⁷ = 78286885441 is a prime.

It is a super-2 number, since 2×78286885569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78286885497 and 78286885506.

It is not an unprimeable number, because it can be changed into a prime (78286885519) 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, 4349271412 + ... + 4349271429.

Almost surely, 2^78286885569 is an apocalyptic number.

It is an amenable number.

78286885569 is a deficient number, since it is larger than the sum of its proper divisors (34794171377).

78286885569 is a wasteful number, since it uses less digits than its factorization.

78286885569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8698542847 (or 8698542844 counting only the distinct ones).

The product of its digits is 464486400, while the sum is 72.

The spelling of 78286885569 in words is "seventy-eight billion, two hundred eighty-six million, eight hundred eighty-five thousand, five hundred sixty-nine".