127667766721 has 8 divisors (see below), whose sum is σ = 140838804000. Its totient is φ = 114757542240.

The previous prime is 127667766719. The next prime is 127667766763.

127667766721 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 127667766721 - 2¹ = 127667766719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127667766221) 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, 65202171 + ... + 65204128.

It is an arithmetic number, because the mean of its divisors is an integer number (17604850500).

Almost surely, 2^127667766721 is an apocalyptic number.

127667766721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127667766721 is a deficient number, since it is larger than the sum of its proper divisors (13171037279).

127667766721 is a wasteful number, since it uses less digits than its factorization.

127667766721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130406399.

The product of its digits is 12446784, while the sum is 58.

The spelling of 127667766721 in words is "one hundred twenty-seven billion, six hundred sixty-seven million, seven hundred sixty-six thousand, seven hundred twenty-one".