78117201216 has 84 divisors (see below), whose sum is σ = 227579592084. Its totient is φ = 25612185600.

The previous prime is 78117201209. The next prime is 78117201229. The reversal of 78117201216 is 61210271187.

It can be written as a sum of positive squares in 2 ways, for example, as 38532119616 + 39585081600 = 196296^2 + 198960^2 .

It is a super-2 number, since 2×78117201216² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1076505 + ... + 1146776.

Almost surely, 2^78117201216 is an apocalyptic number.

It is an amenable number.

78117201216 is an abundant number, since it is smaller than the sum of its proper divisors (149462390868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78117201216 is a wasteful number, since it uses less digits than its factorization.

78117201216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223360 (or 2223347 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 36.

It can be divided in two parts, 7811 and 7201216, that added together give a palindrome (7209027).

The spelling of 78117201216 in words is "seventy-eight billion, one hundred seventeen million, two hundred one thousand, two hundred sixteen".