78538112385066 has 12 divisors (see below), whose sum is σ = 170165910167682. Its totient is φ = 26179370795016.

The previous prime is 78538112385037. The next prime is 78538112385077. The reversal of 78538112385066 is 66058321183587.

78538112385066 is a `hidden beast` number, since 7 + 8 + 5 + 3 + 8 + 112 + 3 + 8 + 506 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 70177831682841 + 8360280702225 = 8377221^2 + 2891415^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78538112384994 and 78538112385012.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2181614232901 + ... + 2181614232936.

Almost surely, 2^{78538112385066} is an apocalyptic number.

78538112385066 is an abundant number, since it is smaller than the sum of its proper divisors (91627797782616).

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

78538112385066 is a wasteful number, since it uses less digits than its factorization.

78538112385066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363228465845 (or 4363228465842 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 78538112385066 in words is "seventy-eight trillion, five hundred thirty-eight billion, one hundred twelve million, three hundred eighty-five thousand, sixty-six".