666825403122 has 54 divisors (see below), whose sum is σ = 1496552089383. Its totient is φ = 214578139104.

The previous prime is 666825403103. The next prime is 666825403157. The reversal of 666825403122 is 221304528666.

It can be written as a sum of positive squares in 5 ways, for example, as 14108450841 + 652716952281 = 118779^2 + 807909^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=577419.

It is a super-2 number, since 2×666825403122² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 100467588 + ... + 100474224.

Almost surely, 2^666825403122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666825403122

666825403122 is an abundant number, since it is smaller than the sum of its proper divisors (829726686261).

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

666825403122 is an frugal number, since it uses more digits than its factorization.

666825403122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340 (or 6671 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 666825403122 in words is "six hundred sixty-six billion, eight hundred twenty-five million, four hundred three thousand, one hundred twenty-two".