1265220277217 has 8 divisors (see below), whose sum is σ = 1366102477824. Its totient is φ = 1164846300048.

The previous prime is 1265220277177. The next prime is 1265220277241. The reversal of 1265220277217 is 7127720225621.

It is a happy number.

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 1265220277217 - 2²² = 1265216082913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265220277817) 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 7 ways as a sum of consecutive naturals, for example, 127050683 + ... + 127060640.

It is an arithmetic number, because the mean of its divisors is an integer number (170762809728).

Almost surely, 2^{1265220277217} is an apocalyptic number.

It is an amenable number.

1265220277217 is a deficient number, since it is larger than the sum of its proper divisors (100882200607).

1265220277217 is a wasteful number, since it uses less digits than its factorization.

1265220277217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254111719.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 1265220277217 in words is "one trillion, two hundred sixty-five billion, two hundred twenty million, two hundred seventy-seven thousand, two hundred seventeen".