78286885529 has 2 divisors, whose sum is σ = 78286885530. Its totient is φ = 78286885528.

The previous prime is 78286885519. The next prime is 78286885627. The reversal of 78286885529 is 92558868287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78220902400 + 65983129 = 279680^2 + 8123^2 .

It is a cyclic number.

It is not a de Polignac number, because 78286885529 - 2¹² = 78286881433 is a prime.

It is a super-2 number, since 2×78286885529² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78286885519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39143442764 + 39143442765.

It is an arithmetic number, because the mean of its divisors is an integer number (39143442765).

Almost surely, 2^78286885529 is an apocalyptic number.

It is an amenable number.

78286885529 is a deficient number, since it is larger than the sum of its proper divisors (1).

78286885529 is an equidigital number, since it uses as much as digits as its factorization.

78286885529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 154828800, while the sum is 68.

The spelling of 78286885529 in words is "seventy-eight billion, two hundred eighty-six million, eight hundred eighty-five thousand, five hundred twenty-nine".