78455117566 has 64 divisors (see below), whose sum is σ = 144005529600. Its totient is φ = 31310289504.

The previous prime is 78455117563. The next prime is 78455117569. The reversal of 78455117566 is 66571155487.

It is an interprime number because it is at equal distance from previous prime (78455117563) and next prime (78455117569).

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 31 ways as a sum of consecutive naturals, for example, 4761955 + ... + 4778401.

It is an arithmetic number, because the mean of its divisors is an integer number (2250086400).

Almost surely, 2^78455117566 is an apocalyptic number.

78455117566 is a deficient number, since it is larger than the sum of its proper divisors (65550412034).

78455117566 is a wasteful number, since it uses less digits than its factorization.

78455117566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16781.

The product of its digits is 7056000, while the sum is 55.

The spelling of 78455117566 in words is "seventy-eight billion, four hundred fifty-five million, one hundred seventeen thousand, five hundred sixty-six".