12169781225 has 12 divisors (see below), whose sum is σ = 17246318784. Its totient is φ = 8344992720.

The previous prime is 12169781201. The next prime is 12169781231. The reversal of 12169781225 is 52218796121.

It is not a de Polignac number, because 12169781225 - 2¹² = 12169777129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34770629 + ... + 34770978.

It is an arithmetic number, because the mean of its divisors is an integer number (1437193232).

Almost surely, 2^12169781225 is an apocalyptic number.

It is an amenable number.

12169781225 is a deficient number, since it is larger than the sum of its proper divisors (5076537559).

12169781225 is an equidigital number, since it uses as much as digits as its factorization.

12169781225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69541624 (or 69541619 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The spelling of 12169781225 in words is "twelve billion, one hundred sixty-nine million, seven hundred eighty-one thousand, two hundred twenty-five".