78855471738837 has 24 divisors (see below), whose sum is σ = 114974320461624. Its totient is φ = 52077752049024.

The previous prime is 78855471738811. The next prime is 78855471738851. The reversal of 78855471738837 is 73883717455887.

78855471738837 is a `hidden beast` number, since 7 + 8 + 8 + 5 + 547 + 1 + 7 + 38 + 8 + 37 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 27288911806641 + 51566559932196 = 5223879^2 + 7180986^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78855471738837 is a prime.

It is a super-2 number, since 2×78855471738837² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78855471738137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90987078 + ... + 91849655.

It is an arithmetic number, because the mean of its divisors is an integer number (4790596685901).

Almost surely, 2^{78855471738837} is an apocalyptic number.

It is an amenable number.

78855471738837 is a deficient number, since it is larger than the sum of its proper divisors (36118848722787).

78855471738837 is a wasteful number, since it uses less digits than its factorization.

78855471738837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182837189 (or 182837186 counting only the distinct ones).

The product of its digits is 8851046400, while the sum is 81.

The spelling of 78855471738837 in words is "seventy-eight trillion, eight hundred fifty-five billion, four hundred seventy-one million, seven hundred thirty-eight thousand, eight hundred thirty-seven".