667504525221 has 64 divisors (see below), whose sum is σ = 1002710016000. Its totient is φ = 438839406720.

The previous prime is 667504525199. The next prime is 667504525283. The reversal of 667504525221 is 122525405766.

667504525221 is a `hidden beast` number, since 6 + 6 + 75 + 0 + 4 + 52 + 522 + 1 = 666.

It is not a de Polignac number, because 667504525221 - 2¹⁷ = 667504394149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667504525291) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 463866220 + ... + 463867658.

It is an arithmetic number, because the mean of its divisors is an integer number (15667344000).

Almost surely, 2^667504525221 is an apocalyptic number.

It is an amenable number.

667504525221 is a deficient number, since it is larger than the sum of its proper divisors (335205490779).

667504525221 is a wasteful number, since it uses less digits than its factorization.

667504525221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311 (or 2305 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 667504525221 in words is "six hundred sixty-seven billion, five hundred four million, five hundred twenty-five thousand, two hundred twenty-one".