127680520157 has 2 divisors, whose sum is σ = 127680520158. Its totient is φ = 127680520156.

The previous prime is 127680520067. The next prime is 127680520159. The reversal of 127680520157 is 751025086721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79482269476 + 48198250681 = 281926^2 + 219541^2 .

It is a cyclic number.

It is not a de Polignac number, because 127680520157 - 2¹⁶ = 127680454621 is a prime.

Together with 127680520159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127680520159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63840260078 + 63840260079.

It is an arithmetic number, because the mean of its divisors is an integer number (63840260079).

Almost surely, 2^127680520157 is an apocalyptic number.

It is an amenable number.

127680520157 is a deficient number, since it is larger than the sum of its proper divisors (1).

127680520157 is an equidigital number, since it uses as much as digits as its factorization.

127680520157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 44.

The spelling of 127680520157 in words is "one hundred twenty-seven billion, six hundred eighty million, five hundred twenty thousand, one hundred fifty-seven".