127636636721 has 8 divisors (see below), whose sum is σ = 139246257600. Its totient is φ = 116028064240.

The previous prime is 127636636717. The next prime is 127636636763.

127636636721 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 127636636721 - 2² = 127636636717 is a prime.

It is a super-2 number, since 2×127636636721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 127636636721.

It is not an unprimeable number, because it can be changed into a prime (127636636121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4235 + ... + 505263.

It is an arithmetic number, because the mean of its divisors is an integer number (17405782200).

Almost surely, 2^127636636721 is an apocalyptic number.

127636636721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127636636721 is a deficient number, since it is larger than the sum of its proper divisors (11609620879).

127636636721 is a wasteful number, since it uses less digits than its factorization.

127636636721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524199.

The product of its digits is 2286144, while the sum is 50.

The spelling of 127636636721 in words is "one hundred twenty-seven billion, six hundred thirty-six million, six hundred thirty-six thousand, seven hundred twenty-one".