1268634445709 has 4 divisors (see below), whose sum is σ = 1269360626304. Its totient is φ = 1267908265116.

The previous prime is 1268634445679. The next prime is 1268634445721. The reversal of 1268634445709 is 9075444368621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268634445709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268634447709) 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, 363087677 + ... + 363091170.

It is an arithmetic number, because the mean of its divisors is an integer number (317340156576).

It is a 1-persistent number, because it is pandigital, but 2⋅1268634445709 = 2537268891418 is not.

Almost surely, 2^{1268634445709} is an apocalyptic number.

It is an amenable number.

1268634445709 is a deficient number, since it is larger than the sum of its proper divisors (726180595).

1268634445709 is an equidigital number, since it uses as much as digits as its factorization.

1268634445709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726180594.

The product of its (nonzero) digits is 34836480, while the sum is 59.

The spelling of 1268634445709 in words is "one trillion, two hundred sixty-eight billion, six hundred thirty-four million, four hundred forty-five thousand, seven hundred nine".