78432169861 has 2 divisors, whose sum is σ = 78432169862. Its totient is φ = 78432169860.

The previous prime is 78432169817. The next prime is 78432169891. The reversal of 78432169861 is 16896123487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65715322500 + 12716847361 = 256350^2 + 112769^2 .

It is a cyclic number.

It is not a de Polignac number, because 78432169861 - 2¹³ = 78432161669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78432169811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39216084930 + 39216084931.

It is an arithmetic number, because the mean of its divisors is an integer number (39216084931).

Almost surely, 2^78432169861 is an apocalyptic number.

It is an amenable number.

78432169861 is a deficient number, since it is larger than the sum of its proper divisors (1).

78432169861 is an equidigital number, since it uses as much as digits as its factorization.

78432169861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 55.

The spelling of 78432169861 in words is "seventy-eight billion, four hundred thirty-two million, one hundred sixty-nine thousand, eight hundred sixty-one".