78516775573281 has 12 divisors (see below), whose sum is σ = 113483607005860. Its totient is φ = 52311984710400.

The previous prime is 78516775573163. The next prime is 78516775573283. The reversal of 78516775573281 is 18237557761587.

78516775573281 is a `hidden beast` number, since 7 + 8 + 5 + 1 + 67 + 7 + 557 + 3 + 2 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 53617673563281 + 24899102010000 = 7322409^2 + 4989900^2 .

It is not a de Polignac number, because 78516775573281 - 2¹¹ = 78516775571233 is a prime.

It is a super-2 number, since 2×78516775573281² (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 (78516775573283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2711012920 + ... + 2711041881.

Almost surely, 2^{78516775573281} is an apocalyptic number.

It is an amenable number.

78516775573281 is a deficient number, since it is larger than the sum of its proper divisors (34966831432579).

78516775573281 is a wasteful number, since it uses less digits than its factorization.

78516775573281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422056416 (or 5422056413 counting only the distinct ones).

The product of its digits is 691488000, while the sum is 72.

The spelling of 78516775573281 in words is "seventy-eight trillion, five hundred sixteen billion, seven hundred seventy-five million, five hundred seventy-three thousand, two hundred eighty-one".