1275416665 has 16 divisors (see below), whose sum is σ = 1605588480. Its totient is φ = 971266240.

The previous prime is 1275416657. The next prime is 1275416669. The reversal of 1275416665 is 5666145721.

It is not a de Polignac number, because 1275416665 - 2³ = 1275416657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1275416669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51649 + ... + 72238.

It is an arithmetic number, because the mean of its divisors is an integer number (100349280).

Almost surely, 2^1275416665 is an apocalyptic number.

It is an amenable number.

1275416665 is a deficient number, since it is larger than the sum of its proper divisors (330171815).

1275416665 is a wasteful number, since it uses less digits than its factorization.

1275416665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123992.

The product of its digits is 302400, while the sum is 43.

The square root of 1275416665 is about 35712.9761431332. The cubic root of 1275416665 is about 1084.4695503600.

The spelling of 1275416665 in words is "one billion, two hundred seventy-five million, four hundred sixteen thousand, six hundred sixty-five".