1271151165621 has 8 divisors (see below), whose sum is σ = 1726846866720. Its totient is φ = 831444787472.

The previous prime is 1271151165617. The next prime is 1271151165623. The reversal of 1271151165621 is 1265611511721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1271151165621 - 2² = 1271151165617 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1271151165621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271151165623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3997330551 + ... + 3997330868.

It is an arithmetic number, because the mean of its divisors is an integer number (215855858340).

Almost surely, 2^{1271151165621} is an apocalyptic number.

It is an amenable number.

1271151165621 is a deficient number, since it is larger than the sum of its proper divisors (455695701099).

1271151165621 is an equidigital number, since it uses as much as digits as its factorization.

1271151165621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7994661475.

The product of its digits is 25200, while the sum is 39.

The spelling of 1271151165621 in words is "one trillion, two hundred seventy-one billion, one hundred fifty-one million, one hundred sixty-five thousand, six hundred twenty-one".