127664565 has 16 divisors (see below), whose sum is σ = 233443968. Its totient is φ = 58360896.

The previous prime is 127664557. The next prime is 127664569. The reversal of 127664565 is 565466721.

It is not a de Polignac number, because 127664565 - 2³ = 127664557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127664569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607822 + ... + 608031.

It is an arithmetic number, because the mean of its divisors is an integer number (14590248).

Almost surely, 2^127664565 is an apocalyptic number.

127664565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

127664565 is a deficient number, since it is larger than the sum of its proper divisors (105779403).

127664565 is a wasteful number, since it uses less digits than its factorization.

127664565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215868.

The product of its digits is 302400, while the sum is 42.

The square root of 127664565 is about 11298.8745014714. The cubic root of 127664565 is about 503.5278039914.

The spelling of 127664565 in words is "one hundred twenty-seven million, six hundred sixty-four thousand, five hundred sixty-five".