1273406620667 has 4 divisors (see below), whose sum is σ = 1273428612456. Its totient is φ = 1273384628880.

The previous prime is 1273406620663. The next prime is 1273406620721. The reversal of 1273406620667 is 7660266043721.

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 1273406620667 - 2² = 1273406620663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273406620663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10908809 + ... + 11024922.

It is an arithmetic number, because the mean of its divisors is an integer number (318357153114).

Almost surely, 2^{1273406620667} is an apocalyptic number.

1273406620667 is a deficient number, since it is larger than the sum of its proper divisors (21991789).

1273406620667 is an equidigital number, since it uses as much as digits as its factorization.

1273406620667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21991788.

The product of its (nonzero) digits is 3048192, while the sum is 50.

The spelling of 1273406620667 in words is "one trillion, two hundred seventy-three billion, four hundred six million, six hundred twenty thousand, six hundred sixty-seven".