78287365997 has 2 divisors, whose sum is σ = 78287365998. Its totient is φ = 78287365996.

The previous prime is 78287365903. The next prime is 78287366021. The reversal of 78287365997 is 79956378287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75606301156 + 2681064841 = 274966^2 + 51779^2 .

It is a cyclic number.

It is not a de Polignac number, because 78287365997 - 2²⁶ = 78220257133 is a prime.

It is a super-2 number, since 2×78287365997² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78287365997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78287367997) 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, 39143682998 + 39143682999.

It is an arithmetic number, because the mean of its divisors is an integer number (39143682999).

Almost surely, 2^78287365997 is an apocalyptic number.

It is an amenable number.

78287365997 is a deficient number, since it is larger than the sum of its proper divisors (1).

78287365997 is an equidigital number, since it uses as much as digits as its factorization.

78287365997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320060160, while the sum is 71.

The spelling of 78287365997 in words is "seventy-eight billion, two hundred eighty-seven million, three hundred sixty-five thousand, nine hundred ninety-seven".