654111778122 has 96 divisors (see below), whose sum is σ = 1597612835520. Its totient is φ = 191674978560.

The previous prime is 654111778097. The next prime is 654111778207. The reversal of 654111778122 is 221877111456.

654111778122 is a `hidden beast` number, since 6 + 541 + 1 + 1 + 7 + 7 + 81 + 22 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 920254 + ... + 1468022.

It is an arithmetic number, because the mean of its divisors is an integer number (16641800370).

Almost surely, 2^654111778122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654111778122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798806417760).

654111778122 is an abundant number, since it is smaller than the sum of its proper divisors (943501057398).

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

654111778122 is a wasteful number, since it uses less digits than its factorization.

654111778122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547988 (or 547985 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

Adding to 654111778122 its reverse (221877111456), we get a palindrome (875988889578).

The spelling of 654111778122 in words is "six hundred fifty-four billion, one hundred eleven million, seven hundred seventy-eight thousand, one hundred twenty-two".