127790668877 has 4 divisors (see below), whose sum is σ = 127828114620. Its totient is φ = 127753223136.

The previous prime is 127790668867. The next prime is 127790668909. The reversal of 127790668877 is 778866097721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59299068196 + 68491600681 = 243514^2 + 261709^2 .

It is a cyclic number.

It is not a de Polignac number, because 127790668877 - 2²² = 127786474573 is a prime.

It is a super-2 number, since 2×127790668877² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127790668867) 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, 18717752 + ... + 18724577.

It is an arithmetic number, because the mean of its divisors is an integer number (31957028655).

Almost surely, 2^127790668877 is an apocalyptic number.

It is an amenable number.

127790668877 is a deficient number, since it is larger than the sum of its proper divisors (37445743).

127790668877 is an equidigital number, since it uses as much as digits as its factorization.

127790668877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37445742.

The product of its (nonzero) digits is 99574272, while the sum is 68.

The spelling of 127790668877 in words is "one hundred twenty-seven billion, seven hundred ninety million, six hundred sixty-eight thousand, eight hundred seventy-seven".