78216116778075 has 48 divisors (see below), whose sum is σ = 129440246544000. Its totient is φ = 41675625331200.

The previous prime is 78216116778053. The next prime is 78216116778091. The reversal of 78216116778075 is 57087761161287.

It is not a de Polignac number, because 78216116778075 - 2⁶ = 78216116778011 is a prime.

It is a super-2 number, since 2×78216116778075² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78216116777997 and 78216116778015.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 335041140 + ... + 335274510.

It is an arithmetic number, because the mean of its divisors is an integer number (2696671803000).

Almost surely, 2^{78216116778075} is an apocalyptic number.

78216116778075 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78216116778075 is a deficient number, since it is larger than the sum of its proper divisors (51224129765925).

78216116778075 is a wasteful number, since it uses less digits than its factorization.

78216116778075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237612 (or 237607 counting only the distinct ones).

The product of its (nonzero) digits is 55319040, while the sum is 66.

The spelling of 78216116778075 in words is "seventy-eight trillion, two hundred sixteen billion, one hundred sixteen million, seven hundred seventy-eight thousand, seventy-five".