78181085385371 has 4 divisors (see below), whose sum is σ = 78229137682872. Its totient is φ = 78133033087872.

The previous prime is 78181085385349. The next prime is 78181085385391. The reversal of 78181085385371 is 17358358018187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78181085385371 - 2³⁸ = 77906207478427 is a prime.

It is a super-2 number, since 2×78181085385371² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78181085385298 and 78181085385307.

It is not an unprimeable number, because it can be changed into a prime (78181085385391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24026146310 + ... + 24026149563.

It is an arithmetic number, because the mean of its divisors is an integer number (19557284420718).

Almost surely, 2^{78181085385371} is an apocalyptic number.

78181085385371 is a deficient number, since it is larger than the sum of its proper divisors (48052297501).

78181085385371 is a wasteful number, since it uses less digits than its factorization.

78181085385371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48052297500.

The product of its (nonzero) digits is 45158400, while the sum is 65.

The spelling of 78181085385371 in words is "seventy-eight trillion, one hundred eighty-one billion, eighty-five million, three hundred eighty-five thousand, three hundred seventy-one".