12461493985 has 4 divisors (see below), whose sum is σ = 14953792788. Its totient is φ = 9969195184.

The previous prime is 12461493983. The next prime is 12461494013. The reversal of 12461493985 is 58939416421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58939416421 = 2243 ⋅26277047.

It can be written as a sum of positive squares in 2 ways, for example, as 7865738721 + 4595755264 = 88689^2 + 67792^2 .

It is a cyclic number.

It is not a de Polignac number, because 12461493985 - 2¹ = 12461493983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12461493983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1246149394 + ... + 1246149403.

It is an arithmetic number, because the mean of its divisors is an integer number (3738448197).

Almost surely, 2^12461493985 is an apocalyptic number.

It is an amenable number.

12461493985 is a deficient number, since it is larger than the sum of its proper divisors (2492298803).

12461493985 is an equidigital number, since it uses as much as digits as its factorization.

12461493985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492298802.

The product of its digits is 1866240, while the sum is 52.

The spelling of 12461493985 in words is "twelve billion, four hundred sixty-one million, four hundred ninety-three thousand, nine hundred eighty-five".