1272522665 has 4 divisors (see below), whose sum is σ = 1527027204. Its totient is φ = 1018018128.

The previous prime is 1272522659. The next prime is 1272522673. The reversal of 1272522665 is 5662252721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 654950464 + 617572201 = 25592^2 + 24851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272522665 - 2¹⁰ = 1272521641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 127252262 + ... + 127252271.

It is an arithmetic number, because the mean of its divisors is an integer number (381756801).

Almost surely, 2^1272522665 is an apocalyptic number.

It is an amenable number.

1272522665 is a deficient number, since it is larger than the sum of its proper divisors (254504539).

1272522665 is an equidigital number, since it uses as much as digits as its factorization.

1272522665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254504538.

The product of its digits is 100800, while the sum is 38.

The square root of 1272522665 is about 35672.4356471492. The cubic root of 1272522665 is about 1083.6486861554.

It can be divided in two parts, 1272 and 522665, that multiplied together give a triangular number (664829880 = T₃₆₄₆₄).

The spelling of 1272522665 in words is "one billion, two hundred seventy-two million, five hundred twenty-two thousand, six hundred sixty-five".