12195050781 has 8 divisors (see below), whose sum is σ = 16427697664. Its totient is φ = 8046218880.

The previous prime is 12195050771. The next prime is 12195050807. The reversal of 12195050781 is 18705059121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12195050781 - 2⁷ = 12195050653 is a prime.

It is a super-2 number, since 2×12195050781² (a number of 21 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 (12195050771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20953405 + ... + 20953986.

It is an arithmetic number, because the mean of its divisors is an integer number (2053462208).

Almost surely, 2^12195050781 is an apocalyptic number.

It is an amenable number.

12195050781 is a deficient number, since it is larger than the sum of its proper divisors (4232646883).

12195050781 is an equidigital number, since it uses as much as digits as its factorization.

12195050781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41907491.

The product of its (nonzero) digits is 25200, while the sum is 39.

The spelling of 12195050781 in words is "twelve billion, one hundred ninety-five million, fifty thousand, seven hundred eighty-one".