127920617487 has 24 divisors (see below), whose sum is σ = 199017441168. Its totient is φ = 78708585600.

The previous prime is 127920617437. The next prime is 127920617491. The reversal of 127920617487 is 784716029721.

127920617487 is a `hidden beast` number, since 12 + 7 + 9 + 2 + 0 + 617 + 4 + 8 + 7 = 666.

It is not a de Polignac number, because 127920617487 - 2¹² = 127920613391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127920617437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 737187 + ... + 894027.

It is an arithmetic number, because the mean of its divisors is an integer number (8292393382).

Almost surely, 2^127920617487 is an apocalyptic number.

127920617487 is a deficient number, since it is larger than the sum of its proper divisors (71096823681).

127920617487 is a wasteful number, since it uses less digits than its factorization.

127920617487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163831 (or 163828 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 127920617487 in words is "one hundred twenty-seven billion, nine hundred twenty million, six hundred seventeen thousand, four hundred eighty-seven".