12163192978 has 4 divisors (see below), whose sum is σ = 18244789470. Its totient is φ = 6081596488.

The previous prime is 12163192973. The next prime is 12163192981. The reversal of 12163192978 is 87929136121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87929136121 = 57601 ⋅1526521.

It can be written as a sum of positive squares in only one way, i.e., 7637536449 + 4525656529 = 87393^2 + 67273^2 .

It is not an unprimeable number, because it can be changed into a prime (12163192973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3040798243 + ... + 3040798246.

Almost surely, 2^12163192978 is an apocalyptic number.

12163192978 is a deficient number, since it is larger than the sum of its proper divisors (6081596492).

12163192978 is an equidigital number, since it uses as much as digits as its factorization.

12163192978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081596491.

The product of its digits is 326592, while the sum is 49.

The spelling of 12163192978 in words is "twelve billion, one hundred sixty-three million, one hundred ninety-two thousand, nine hundred seventy-eight".