78410512909 has 2 divisors, whose sum is σ = 78410512910. Its totient is φ = 78410512908.

The previous prime is 78410512889. The next prime is 78410512937. The reversal of 78410512909 is 90921501487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68220216100 + 10190296809 = 261190^2 + 100947^2 .

It is a cyclic number.

It is not a de Polignac number, because 78410512909 - 2⁷ = 78410512781 is a prime.

It is a super-2 number, since 2×78410512909² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78410512949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39205256454 + 39205256455.

It is an arithmetic number, because the mean of its divisors is an integer number (39205256455).

Almost surely, 2^78410512909 is an apocalyptic number.

It is an amenable number.

78410512909 is a deficient number, since it is larger than the sum of its proper divisors (1).

78410512909 is an equidigital number, since it uses as much as digits as its factorization.

78410512909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 78410512909 in words is "seventy-eight billion, four hundred ten million, five hundred twelve thousand, nine hundred nine".