667440374481 has 6 divisors (see below), whose sum is σ = 964080540930. Its totient is φ = 444960249648.

The previous prime is 667440374479. The next prime is 667440374501. The reversal of 667440374481 is 184473044766.

667440374481 is a `hidden beast` number, since 66 + 74 + 4 + 0 + 37 + 4 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 664192400400 + 3247974081 = 814980^2 + 56991^2 .

It is not a de Polignac number, because 667440374481 - 2¹ = 667440374479 is a prime.

It is a super-2 number, since 2×667440374481² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667440374441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37080020796 + ... + 37080020813.

It is an arithmetic number, because the mean of its divisors is an integer number (160680090155).

Almost surely, 2^667440374481 is an apocalyptic number.

It is an amenable number.

667440374481 is a deficient number, since it is larger than the sum of its proper divisors (296640166449).

667440374481 is a wasteful number, since it uses less digits than its factorization.

667440374481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74160041615 (or 74160041612 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 54.

The spelling of 667440374481 in words is "six hundred sixty-seven billion, four hundred forty million, three hundred seventy-four thousand, four hundred eighty-one".