667060868055420 has 144 divisors (see below), whose sum is σ = 2029287928292352. Its totient is φ = 177367126302720.

The previous prime is 667060868055403. The next prime is 667060868055487. The reversal of 667060868055420 is 24550868060766.

It is a happy number.

667060868055420 is a `hidden beast` number, since 6 + 6 + 7 + 0 + 6 + 0 + 8 + 6 + 80 + 5 + 542 + 0 = 666.

It is a super-2 number, since 2×667060868055420² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 237203484 + ... + 239999196.

It is an arithmetic number, because the mean of its divisors is an integer number (14092277279808).

Almost surely, 2^{667060868055420} is an apocalyptic number.

667060868055420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667060868055420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014643964146176).

667060868055420 is an abundant number, since it is smaller than the sum of its proper divisors (1362227060236932).

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

667060868055420 is a wasteful number, since it uses less digits than its factorization.

667060868055420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799572 (or 2799567 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 63.

The spelling of 667060868055420 in words is "six hundred sixty-seven trillion, sixty billion, eight hundred sixty-eight million, fifty-five thousand, four hundred twenty".