1271662768667 has 4 divisors (see below), whose sum is σ = 1271936661480. Its totient is φ = 1271388875856.

The previous prime is 1271662768601. The next prime is 1271662768697. The reversal of 1271662768667 is 7668672661721.

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

It is a cyclic number.

It is not a de Polignac number, because 1271662768667 - 2²² = 1271658574363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271662768697) 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, 136939442 + ... + 136948727.

It is an arithmetic number, because the mean of its divisors is an integer number (317984165370).

Almost surely, 2^{1271662768667} is an apocalyptic number.

1271662768667 is a deficient number, since it is larger than the sum of its proper divisors (273892813).

1271662768667 is an equidigital number, since it uses as much as digits as its factorization.

1271662768667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273892812.

The product of its digits is 85349376, while the sum is 65.

The spelling of 1271662768667 in words is "one trillion, two hundred seventy-one billion, six hundred sixty-two million, seven hundred sixty-eight thousand, six hundred sixty-seven".