77881944552 has 256 divisors, whose sum is σ = 216689541120. Its totient is φ = 23218790400.

The previous prime is 77881944551. The next prime is 77881944563. The reversal of 77881944552 is 25544918877.

It is not an unprimeable number, because it can be changed into a prime (77881944551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 248823948 + ... + 248824260.

It is an arithmetic number, because the mean of its divisors is an integer number (846443520).

Almost surely, 2^77881944552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77881944552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108344770560).

77881944552 is an abundant number, since it is smaller than the sum of its proper divisors (138807596568).

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

77881944552 is a wasteful number, since it uses less digits than its factorization.

77881944552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 660 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 60.

The spelling of 77881944552 in words is "seventy-seven billion, eight hundred eighty-one million, nine hundred forty-four thousand, five hundred fifty-two".