12738865451 has 4 divisors (see below), whose sum is σ = 13718778192. Its totient is φ = 11758952712.

The previous prime is 12738865421. The next prime is 12738865471. The reversal of 12738865451 is 15456883721.

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

It is a de Polignac number, because none of the positive numbers 2^k-12738865451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12738865451.

It is not an unprimeable number, because it can be changed into a prime (12738865421) 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, 489956351 + ... + 489956376.

It is an arithmetic number, because the mean of its divisors is an integer number (3429694548).

Almost surely, 2^12738865451 is an apocalyptic number.

12738865451 is a deficient number, since it is larger than the sum of its proper divisors (979912741).

12738865451 is an equidigital number, since it uses as much as digits as its factorization.

12738865451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979912740.

The product of its digits is 1612800, while the sum is 50.

The spelling of 12738865451 in words is "twelve billion, seven hundred thirty-eight million, eight hundred sixty-five thousand, four hundred fifty-one".