12161036454778 has 4 divisors (see below), whose sum is σ = 18241554682170. Its totient is φ = 6080518227388.

The previous prime is 12161036454767. The next prime is 12161036454793. The reversal of 12161036454778 is 87745463016121.

12161036454778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 11410053027129 + 750983427649 = 3377877^2 + 866593^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3040259113693 + ... + 3040259113696.

Almost surely, 2^{12161036454778} is an apocalyptic number.

12161036454778 is a deficient number, since it is larger than the sum of its proper divisors (6080518227392).

12161036454778 is an equidigital number, since it uses as much as digits as its factorization.

12161036454778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080518227391.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 12161036454778 in words is "twelve trillion, one hundred sixty-one billion, thirty-six million, four hundred fifty-four thousand, seven hundred seventy-eight".