78418410243889 has 9 divisors (see below), whose sum is σ = 78543088482081. Its totient is φ = 78293929647120.

The previous prime is 78418410243871. The next prime is 78418410243907. The reversal of 78418410243889 is 98834201481487.

The square root of 78418410243889 is 8855417.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (78418410243871) and next prime (78418410243907).

It can be written as a sum of positive squares in 4 ways, for example, as 6307607135025 + 72110803108864 = 2511495^2 + 8491808^2 .

It is not a de Polignac number, because 78418410243889 - 2¹¹ = 78418410241841 is a prime.

It is a super-2 number, since 2×78418410243889² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78418410243809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5853423939 + ... + 5853437335.

Almost surely, 2^{78418410243889} is an apocalyptic number.

78418410243889 is the 8855417-th square number.

78418410243889 is the 4427709-th centered octagonal number.

It is an amenable number.

78418410243889 is a deficient number, since it is larger than the sum of its proper divisors (124678238192).

78418410243889 is an frugal number, since it uses more digits than its factorization.

78418410243889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28116 (or 14058 counting only the distinct ones).

The product of its (nonzero) digits is 99090432, while the sum is 67.

The spelling of 78418410243889 in words is "seventy-eight trillion, four hundred eighteen billion, four hundred ten million, two hundred forty-three thousand, eight hundred eighty-nine".