1265027665 has 16 divisors (see below), whose sum is σ = 1656754560. Its totient is φ = 919621120.

The previous prime is 1265027663. The next prime is 1265027671. The reversal of 1265027665 is 5667205621.

It is not a de Polignac number, because 1265027665 - 2¹ = 1265027663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1265027663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195756 + ... + 202114.

It is an arithmetic number, because the mean of its divisors is an integer number (103547160).

Almost surely, 2^1265027665 is an apocalyptic number.

It is an amenable number.

1265027665 is a deficient number, since it is larger than the sum of its proper divisors (391726895).

1265027665 is a wasteful number, since it uses less digits than its factorization.

1265027665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9992.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 1265027665 is about 35567.2274010781. The cubic root of 1265027665 is about 1081.5169768975.

The spelling of 1265027665 in words is "one billion, two hundred sixty-five million, twenty-seven thousand, six hundred sixty-five".