1268713451609 has 4 divisors (see below), whose sum is σ = 1292651441316. Its totient is φ = 1244775461904.

The previous prime is 1268713451539. The next prime is 1268713451627. The reversal of 1268713451609 is 9061543178621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1141164472009 + 127548979600 = 1068253^2 + 357140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268713451609 - 2²⁴ = 1268696674393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 23937989653 = 1268713451609 / (1 + 2 + 6 + 8 + 7 + 1 + 3 + 4 + 5 + 1 + 6 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268713451009) 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, 11968994774 + ... + 11968994879.

It is an arithmetic number, because the mean of its divisors is an integer number (323162860329).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1268713451609 = 2537426903218, but 3⋅1268713451609 = 3806140354827 is not.

Almost surely, 2^{1268713451609} is an apocalyptic number.

It is an amenable number.

1268713451609 is a deficient number, since it is larger than the sum of its proper divisors (23937989707).

1268713451609 is an equidigital number, since it uses as much as digits as its factorization.

1268713451609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23937989706.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 1268713451609 in words is "one trillion, two hundred sixty-eight billion, seven hundred thirteen million, four hundred fifty-one thousand, six hundred nine".