77543866780 has 24 divisors (see below), whose sum is σ = 162847359360. Its totient is φ = 31016548800.

The previous prime is 77543866753. The next prime is 77543866783. The reversal of 77543866780 is 8766834577.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77543866783) 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, 1142805 + ... + 1208755.

It is an arithmetic number, because the mean of its divisors is an integer number (6785306640).

Almost surely, 2^77543866780 is an apocalyptic number.

It is an amenable number.

77543866780 is an abundant number, since it is smaller than the sum of its proper divisors (85303492580).

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

77543866780 is a wasteful number, since it uses less digits than its factorization.

77543866780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124749 (or 124747 counting only the distinct ones).

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 77543866780 in words is "seventy-seven billion, five hundred forty-three million, eight hundred sixty-six thousand, seven hundred eighty".