12780497945 has 8 divisors (see below), whose sum is σ = 15530732160. Its totient is φ = 10094975280.

The previous prime is 12780497927. The next prime is 12780497959. The reversal of 12780497945 is 54979408721.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-12780497945 is a prime.

It is a super-2 number, since 2×12780497945² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 16177451 + ... + 16178240.

It is an arithmetic number, because the mean of its divisors is an integer number (1941341520).

Almost surely, 2^12780497945 is an apocalyptic number.

It is an amenable number.

12780497945 is a deficient number, since it is larger than the sum of its proper divisors (2750234215).

12780497945 is an equidigital number, since it uses as much as digits as its factorization.

12780497945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32355775.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 12780497945 in words is "twelve billion, seven hundred eighty million, four hundred ninety-seven thousand, nine hundred forty-five".