12178077487181 has 4 divisors (see below), whose sum is σ = 12232687700352. Its totient is φ = 12123467274012.

The previous prime is 12178077487157. The next prime is 12178077487183. The reversal of 12178077487181 is 18178477087121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12178077487181 - 2²² = 12178073292877 is a prime.

It is a super-2 number, since 2×12178077487181² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12178077487183) 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, 27305106251 + ... + 27305106696.

It is an arithmetic number, because the mean of its divisors is an integer number (3058171925088).

Almost surely, 2^{12178077487181} is an apocalyptic number.

It is an amenable number.

12178077487181 is a deficient number, since it is larger than the sum of its proper divisors (54610213171).

12178077487181 is an equidigital number, since it uses as much as digits as its factorization.

12178077487181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54610213170.

The product of its (nonzero) digits is 9834496, while the sum is 62.

The spelling of 12178077487181 in words is "twelve trillion, one hundred seventy-eight billion, seventy-seven million, four hundred eighty-seven thousand, one hundred eighty-one".