127722665 has 12 divisors (see below), whose sum is σ = 178290756. Its totient is φ = 87581088.

The previous prime is 127722653. The next prime is 127722671. The reversal of 127722665 is 566227721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 92236816 + 35485849 = 9604^2 + 5957^2 .

It is not a de Polignac number, because 127722665 - 2⁶ = 127722601 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260414 + ... + 260903.

It is an arithmetic number, because the mean of its divisors is an integer number (14857563).

Almost surely, 2^127722665 is an apocalyptic number.

It is an amenable number.

127722665 is a deficient number, since it is larger than the sum of its proper divisors (50568091).

127722665 is an equidigital number, since it uses as much as digits as its factorization.

127722665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521336 (or 521329 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 127722665 is about 11301.4452615584. The cubic root of 127722665 is about 503.6041773859.

The spelling of 127722665 in words is "one hundred twenty-seven million, seven hundred twenty-two thousand, six hundred sixty-five".