12782998985 has 4 divisors (see below), whose sum is σ = 15339598788. Its totient is φ = 10226399184.

The previous prime is 12782998981. The next prime is 12782998993. The reversal of 12782998985 is 58989928721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5591450176 + 7191548809 = 74776^2 + 84803^2 .

It is a cyclic number.

It is not a de Polignac number, because 12782998985 - 2² = 12782998981 is a prime.

It is a super-2 number, since 2×12782998985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12782998981) 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, 1278299894 + ... + 1278299903.

It is an arithmetic number, because the mean of its divisors is an integer number (3834899697).

Almost surely, 2^12782998985 is an apocalyptic number.

It is an amenable number.

12782998985 is a deficient number, since it is larger than the sum of its proper divisors (2556599803).

12782998985 is an equidigital number, since it uses as much as digits as its factorization.

12782998985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556599802.

The product of its digits is 52254720, while the sum is 68.

The spelling of 12782998985 in words is "twelve billion, seven hundred eighty-two million, nine hundred ninety-eight thousand, nine hundred eighty-five".