127512637649 has 4 divisors (see below), whose sum is σ = 129603008820. Its totient is φ = 125422266480.

The previous prime is 127512637639. The next prime is 127512637711. The reversal of 127512637649 is 946736215721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946736215721 = 347 ⋅2728346443.

It can be written as a sum of positive squares in 2 ways, for example, as 41511210049 + 86001427600 = 203743^2 + 293260^2 .

It is a cyclic number.

It is not a de Polignac number, because 127512637649 - 2⁴ = 127512637633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127512637649.

It is not an unprimeable number, because it can be changed into a prime (127512637639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1045185494 + ... + 1045185615.

It is an arithmetic number, because the mean of its divisors is an integer number (32400752205).

Almost surely, 2^127512637649 is an apocalyptic number.

It is an amenable number.

127512637649 is a deficient number, since it is larger than the sum of its proper divisors (2090371171).

127512637649 is an equidigital number, since it uses as much as digits as its factorization.

127512637649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090371170.

The product of its digits is 3810240, while the sum is 53.

The spelling of 127512637649 in words is "one hundred twenty-seven billion, five hundred twelve million, six hundred thirty-seven thousand, six hundred forty-nine".