77544444222 has 144 divisors (see below), whose sum is σ = 205921647360. Its totient is φ = 20969946144.

The previous prime is 77544444101. The next prime is 77544444277. The reversal of 77544444222 is 22244444577.

77544444222 is a `hidden beast` number, since 7 + 7 + 544 + 44 + 42 + 22 = 666.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 34570633 + ... + 34572875.

It is an arithmetic number, because the mean of its divisors is an integer number (1430011440).

Almost surely, 2^77544444222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77544444222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102960823680).

77544444222 is an abundant number, since it is smaller than the sum of its proper divisors (128377203138).

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

77544444222 is a wasteful number, since it uses less digits than its factorization.

77544444222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4347 (or 4337 counting only the distinct ones).

The product of its digits is 2007040, while the sum is 45.

Adding to 77544444222 its reverse (22244444577), we get a palindrome (99788888799).

The spelling of 77544444222 in words is "seventy-seven billion, five hundred forty-four million, four hundred forty-four thousand, two hundred twenty-two".