127065602721 has 4 divisors (see below), whose sum is σ = 169420803632. Its totient is φ = 84710401812.

The previous prime is 127065602663. The next prime is 127065602747. The reversal of 127065602721 is 127206560721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 127065602721 - 2⁷ = 127065602593 is a prime.

It is a super-2 number, since 2×127065602721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127065602721.

It is not an unprimeable number, because it can be changed into a prime (127065602021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21177600451 + ... + 21177600456.

It is an arithmetic number, because the mean of its divisors is an integer number (42355200908).

Almost surely, 2^127065602721 is an apocalyptic number.

It is an amenable number.

127065602721 is a deficient number, since it is larger than the sum of its proper divisors (42355200911).

127065602721 is an equidigital number, since it uses as much as digits as its factorization.

127065602721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42355200910.

The product of its (nonzero) digits is 70560, while the sum is 39.

The spelling of 127065602721 in words is "one hundred twenty-seven billion, sixty-five million, six hundred two thousand, seven hundred twenty-one".