127772560721 has 8 divisors (see below), whose sum is σ = 143583881280. Its totient is φ = 112815906192.

The previous prime is 127772560709. The next prime is 127772560753. The reversal of 127772560721 is 127065277721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127772560721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127772560771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213666191 + ... + 213666788.

It is an arithmetic number, because the mean of its divisors is an integer number (17947985160).

Almost surely, 2^127772560721 is an apocalyptic number.

It is an amenable number.

127772560721 is a deficient number, since it is larger than the sum of its proper divisors (15811320559).

127772560721 is a wasteful number, since it uses less digits than its factorization.

127772560721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427333015.

The product of its (nonzero) digits is 576240, while the sum is 47.

The spelling of 127772560721 in words is "one hundred twenty-seven billion, seven hundred seventy-two million, five hundred sixty thousand, seven hundred twenty-one".