977778756544 has 28 divisors (see below), whose sum is σ = 1940418649000. Its totient is φ = 488854372608.

The previous prime is 977778756517. The next prime is 977778756547. The reversal of 977778756544 is 445657877779.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977778756547) 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 3 ways as a sum of consecutive naturals, for example, 365647 + ... + 1445425.

Almost surely, 2^977778756544 is an apocalyptic number.

It is an amenable number.

977778756544 is a deficient number, since it is larger than the sum of its proper divisors (962639892456).

977778756544 is a wasteful number, since it uses less digits than its factorization.

977778756544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093940 (or 1093930 counting only the distinct ones).

The product of its digits is 2904249600, while the sum is 76.

The spelling of 977778756544 in words is "nine hundred seventy-seven billion, seven hundred seventy-eight million, seven hundred fifty-six thousand, five hundred forty-four".