12320185978 has 4 divisors (see below), whose sum is σ = 18480278970. Its totient is φ = 6160092988.

The previous prime is 12320185931. The next prime is 12320186057. The reversal of 12320185978 is 87958102321.

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: 87958102321 = 1327 ⋅66283423.

It can be written as a sum of positive squares in only one way, i.e., 10003400289 + 2316785689 = 100017^2 + 48133^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3080046493 + ... + 3080046496.

Almost surely, 2^12320185978 is an apocalyptic number.

12320185978 is a deficient number, since it is larger than the sum of its proper divisors (6160092992).

12320185978 is an equidigital number, since it uses as much as digits as its factorization.

12320185978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6160092991.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 12320185978 in words is "twelve billion, three hundred twenty million, one hundred eighty-five thousand, nine hundred seventy-eight".