78347974455 has 24 divisors (see below), whose sum is σ = 135827644992. Its totient is φ = 41778051264.

The previous prime is 78347974361. The next prime is 78347974493. The reversal of 78347974455 is 55447974387.

78347974455 is a `hidden beast` number, since 78 + 3 + 47 + 9 + 74 + 455 = 666.

It is not a de Polignac number, because 78347974455 - 2²⁰ = 78346925879 is a prime.

It is a super-2 number, since 2×78347974455² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78347974392 and 78347974401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99957 + ... + 408273.

It is an arithmetic number, because the mean of its divisors is an integer number (5659485208).

Almost surely, 2^78347974455 is an apocalyptic number.

78347974455 is a deficient number, since it is larger than the sum of its proper divisors (57479670537).

78347974455 is a wasteful number, since it uses less digits than its factorization.

78347974455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313975 (or 313972 counting only the distinct ones).

The product of its digits is 118540800, while the sum is 63.

The spelling of 78347974455 in words is "seventy-eight billion, three hundred forty-seven million, nine hundred seventy-four thousand, four hundred fifty-five".