12781518496 has 12 divisors (see below), whose sum is σ = 25163614602. Its totient is φ = 6390759232.

The previous prime is 12781518469. The next prime is 12781518499. The reversal of 12781518496 is 69481518721.

It can be written as a sum of positive squares in only one way, i.e., 6631822096 + 6149696400 = 81436^2 + 78420^2 .

It is not an unprimeable number, because it can be changed into a prime (12781518499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199711195 + ... + 199711258.

Almost surely, 2^12781518496 is an apocalyptic number.

12781518496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12781518496 is a deficient number, since it is larger than the sum of its proper divisors (12382096106).

12781518496 is an equidigital number, since it uses as much as digits as its factorization.

12781518496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399422463 (or 399422455 counting only the distinct ones).

The product of its digits is 967680, while the sum is 52.

The spelling of 12781518496 in words is "twelve billion, seven hundred eighty-one million, five hundred eighteen thousand, four hundred ninety-six".