665154112122 has 80 divisors (see below), whose sum is σ = 1538929497600. Its totient is φ = 214508256480.

The previous prime is 665154112087. The next prime is 665154112141. The reversal of 665154112122 is 221211451566.

665154112122 is a `hidden beast` number, since 6 + 6 + 515 + 4 + 1 + 12 + 122 = 666.

It is a super-2 number, since 2×665154112122² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21222379 + ... + 21253697.

It is an arithmetic number, because the mean of its divisors is an integer number (19236618720).

Almost surely, 2^665154112122 is an apocalyptic number.

665154112122 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 665154112122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (769464748800).

665154112122 is an abundant number, since it is smaller than the sum of its proper divisors (873775385478).

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

665154112122 is a wasteful number, since it uses less digits than its factorization.

665154112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35593 (or 35584 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

Adding to 665154112122 its reverse (221211451566), we get a palindrome (886365563688).

The spelling of 665154112122 in words is "six hundred sixty-five billion, one hundred fifty-four million, one hundred twelve thousand, one hundred twenty-two".