77580550500 has 96 divisors (see below), whose sum is σ = 226269808128. Its totient is φ = 20655616000.

The previous prime is 77580550477. The next prime is 77580550501. The reversal of 77580550500 is 505508577.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77580550501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 921157 + ... + 1001843.

It is an arithmetic number, because the mean of its divisors is an integer number (2356977168).

Almost surely, 2^77580550500 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 77580550500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113134904064).

77580550500 is an abundant number, since it is smaller than the sum of its proper divisors (148689257628).

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

77580550500 is a wasteful number, since it uses less digits than its factorization.

77580550500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81350 (or 81338 counting only the distinct ones).

The product of its (nonzero) digits is 245000, while the sum is 42.

The spelling of 77580550500 in words is "seventy-seven billion, five hundred eighty million, five hundred fifty thousand, five hundred".