127780646477 has 16 divisors (see below), whose sum is σ = 147252318720. Its totient is φ = 109661396400.

The previous prime is 127780646449. The next prime is 127780646527. The reversal of 127780646477 is 774646087721.

It is a cyclic number.

It is not a de Polignac number, because 127780646477 - 2¹⁰ = 127780645453 is a prime.

It is a super-2 number, since 2×127780646477² (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 (127780646177) 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 15 ways as a sum of consecutive naturals, for example, 1021049 + ... + 1139342.

It is an arithmetic number, because the mean of its divisors is an integer number (9203269920).

Almost surely, 2^127780646477 is an apocalyptic number.

It is an amenable number.

127780646477 is a deficient number, since it is larger than the sum of its proper divisors (19471672243).

127780646477 is a wasteful number, since it uses less digits than its factorization.

127780646477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160704.

The product of its (nonzero) digits is 22127616, while the sum is 59.

The spelling of 127780646477 in words is "one hundred twenty-seven billion, seven hundred eighty million, six hundred forty-six thousand, four hundred seventy-seven".