127478989765 has 16 divisors (see below), whose sum is σ = 153338540400. Its totient is φ = 101740959232.

The previous prime is 127478989753. The next prime is 127478989783. The reversal of 127478989765 is 567989874721.

It is a Cunningham number, because it is equal to 357042²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 127478989764 = 1^2 + 357042^2 .

It is a cyclic number.

It is not a de Polignac number, because 127478989765 - 2⁷ = 127478989637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3996801 + ... + 4028569.

It is an arithmetic number, because the mean of its divisors is an integer number (9583658775).

Almost surely, 2^127478989765 is an apocalyptic number.

It is an amenable number.

127478989765 is a deficient number, since it is larger than the sum of its proper divisors (25859550635).

127478989765 is a wasteful number, since it uses less digits than its factorization.

127478989765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33656.

The product of its digits is 426746880, while the sum is 73.

The spelling of 127478989765 in words is "one hundred twenty-seven billion, four hundred seventy-eight million, nine hundred eighty-nine thousand, seven hundred sixty-five".