78455117565 has 128 divisors (see below), whose sum is σ = 154784931840. Its totient is φ = 37387008000.

The previous prime is 78455117563. The next prime is 78455117569. The reversal of 78455117565 is 56571155487.

78455117565 is a `hidden beast` number, since 7 + 84 + 551 + 1 + 7 + 5 + 6 + 5 = 666.

It is not a de Polignac number, because 78455117565 - 2¹ = 78455117563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78455117563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 21748992 + ... + 21752598.

It is an arithmetic number, because the mean of its divisors is an integer number (1209257280).

Almost surely, 2^78455117565 is an apocalyptic number.

It is an amenable number.

78455117565 is a deficient number, since it is larger than the sum of its proper divisors (76329814275).

78455117565 is a wasteful number, since it uses less digits than its factorization.

78455117565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880 (or 3874 counting only the distinct ones).

The product of its digits is 5880000, while the sum is 54.

The spelling of 78455117565 in words is "seventy-eight billion, four hundred fifty-five million, one hundred seventeen thousand, five hundred sixty-five".