1272485473681 has 4 divisors (see below), whose sum is σ = 1273341215232. Its totient is φ = 1271629732132.

The previous prime is 1272485473639. The next prime is 1272485473703. The reversal of 1272485473681 is 1863745842721.

It is a happy number.

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 not a de Polignac number, because 1272485473681 - 2²⁷ = 1272351255953 is a prime.

It is a super-2 number, since 2×1272485473681² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272485473631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427868545 + ... + 427871518.

It is an arithmetic number, because the mean of its divisors is an integer number (318335303808).

Almost surely, 2^{1272485473681} is an apocalyptic number.

It is an amenable number.

1272485473681 is a deficient number, since it is larger than the sum of its proper divisors (855741551).

1272485473681 is an equidigital number, since it uses as much as digits as its factorization.

1272485473681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855741550.

The product of its digits is 18063360, while the sum is 58.

The spelling of 1272485473681 in words is "one trillion, two hundred seventy-two billion, four hundred eighty-five million, four hundred seventy-three thousand, six hundred eighty-one".