12666781415 has 8 divisors (see below), whose sum is σ = 15201120528. Its totient is φ = 10132769920.

The previous prime is 12666781411. The next prime is 12666781423. The reversal of 12666781415 is 51418766621.

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

It is not a de Polignac number, because 12666781415 - 2² = 12666781411 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 12666781415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666781411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13199 + ... + 159711.

It is an arithmetic number, because the mean of its divisors is an integer number (1900140066).

Almost surely, 2^12666781415 is an apocalyptic number.

12666781415 is a deficient number, since it is larger than the sum of its proper divisors (2534339113).

12666781415 is a wasteful number, since it uses less digits than its factorization.

12666781415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163809.

The product of its digits is 483840, while the sum is 47.

The spelling of 12666781415 in words is "twelve billion, six hundred sixty-six million, seven hundred eighty-one thousand, four hundred fifteen".