78543655281 has 24 divisors (see below), whose sum is σ = 139633166400. Its totient is φ = 41429619936.

The previous prime is 78543655261. The next prime is 78543655291. The reversal of 78543655281 is 18255634587.

78543655281 is a `hidden beast` number, since 7 + 8 + 5 + 4 + 3 + 6 + 552 + 81 = 666.

It is not a de Polignac number, because 78543655281 - 2⁵ = 78543655249 is a prime.

It is a super-2 number, since 2×78543655281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78543655231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47950131 + ... + 47951768.

It is an arithmetic number, because the mean of its divisors is an integer number (5818048600).

Almost surely, 2^78543655281 is an apocalyptic number.

It is an amenable number.

78543655281 is a deficient number, since it is larger than the sum of its proper divisors (61089511119).

78543655281 is a wasteful number, since it uses less digits than its factorization.

78543655281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95901925 (or 95901922 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 78543655281 in words is "seventy-eight billion, five hundred forty-three million, six hundred fifty-five thousand, two hundred eighty-one".