78441804863867 has 2 divisors, whose sum is σ = 78441804863868. Its totient is φ = 78441804863866.

The previous prime is 78441804863843. The next prime is 78441804864043. The reversal of 78441804863867 is 76836840814487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78441804863867 - 2⁶ = 78441804863803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78441804863794 and 78441804863803.

It is not a weakly prime, because it can be changed into another prime (78441804863167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39220902431933 + 39220902431934.

It is an arithmetic number, because the mean of its divisors is an integer number (39220902431934).

Almost surely, 2^{78441804863867} is an apocalyptic number.

78441804863867 is a deficient number, since it is larger than the sum of its proper divisors (1).

78441804863867 is an equidigital number, since it uses as much as digits as its factorization.

78441804863867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1387266048, while the sum is 74.

The spelling of 78441804863867 in words is "seventy-eight trillion, four hundred forty-one billion, eight hundred four million, eight hundred sixty-three thousand, eight hundred sixty-seven".