78821538424047 has 24 divisors (see below), whose sum is σ = 113967528489360. Its totient is φ = 52494989043840.

The previous prime is 78821538424037. The next prime is 78821538424121. The reversal of 78821538424047 is 74042483512887.

78821538424047 is a `hidden beast` number, since 7 + 8 + 8 + 2 + 1 + 5 + 384 + 240 + 4 + 7 = 666.

It is not a de Polignac number, because 78821538424047 - 2³¹ = 78819390940399 is a prime.

It is a super-3 number, since 3×78821538424047³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78821538424037) by changing a digit.

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, 792150403 + ... + 792249899.

It is an arithmetic number, because the mean of its divisors is an integer number (4748647020390).

Almost surely, 2^{78821538424047} is an apocalyptic number.

78821538424047 is a deficient number, since it is larger than the sum of its proper divisors (35145990065313).

78821538424047 is a wasteful number, since it uses less digits than its factorization.

78821538424047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186903 (or 186900 counting only the distinct ones).

The product of its (nonzero) digits is 96337920, while the sum is 63.

The spelling of 78821538424047 in words is "seventy-eight trillion, eight hundred twenty-one billion, five hundred thirty-eight million, four hundred twenty-four thousand, forty-seven".