1277776216788 has 24 divisors (see below), whose sum is σ = 2983812626592. Its totient is φ = 425591864544.

The previous prime is 1277776216781. The next prime is 1277776216879. The reversal of 1277776216788 is 8876126777721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277776216781) 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 7 ways as a sum of consecutive naturals, for example, 41676670 + ... + 41707317.

It is an arithmetic number, because the mean of its divisors is an integer number (124325526108).

Almost surely, 2^{1277776216788} is an apocalyptic number.

It is an amenable number.

1277776216788 is an abundant number, since it is smaller than the sum of its proper divisors (1706036409804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1277776216788 is a wasteful number, since it uses less digits than its factorization.

1277776216788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83385271 (or 83385269 counting only the distinct ones).

The product of its digits is 154893312, while the sum is 69.

The spelling of 1277776216788 in words is "one trillion, two hundred seventy-seven billion, seven hundred seventy-six million, two hundred sixteen thousand, seven hundred eighty-eight".