12311723073978 has 12 divisors (see below), whose sum is σ = 26675399993658. Its totient is φ = 4103907691320.

The previous prime is 12311723073973. The next prime is 12311723074009. The reversal of 12311723073978 is 87937032711321.

12311723073978 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 17 + 230 + 7 + 397 + 8 = 666.

12311723073978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10032821856369 + 2278901217609 = 3167463^2 + 1509603^2 .

It is not an unprimeable number, because it can be changed into a prime (12311723073971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 341992307593 + ... + 341992307628.

Almost surely, 2^{12311723073978} is an apocalyptic number.

12311723073978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12311723073978 is an abundant number, since it is smaller than the sum of its proper divisors (14363676919680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12311723073978 is a wasteful number, since it uses less digits than its factorization.

12311723073978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683984615229 (or 683984615226 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The spelling of 12311723073978 in words is "twelve trillion, three hundred eleven billion, seven hundred twenty-three million, seventy-three thousand, nine hundred seventy-eight".