127690636987 has 2 divisors, whose sum is σ = 127690636988. Its totient is φ = 127690636986.

The previous prime is 127690636937. The next prime is 127690636993. The reversal of 127690636987 is 789636096721.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 127690636987 - 2⁷ = 127690636859 is a prime.

It is not a weakly prime, because it can be changed into another prime (127690636937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63845318493 + 63845318494.

It is an arithmetic number, because the mean of its divisors is an integer number (63845318494).

Almost surely, 2^127690636987 is an apocalyptic number.

127690636987 is a deficient number, since it is larger than the sum of its proper divisors (1).

127690636987 is an equidigital number, since it uses as much as digits as its factorization.

127690636987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41150592, while the sum is 64.

The spelling of 127690636987 in words is "one hundred twenty-seven billion, six hundred ninety million, six hundred thirty-six thousand, nine hundred eighty-seven".