667406547 has 12 divisors (see below), whose sum is σ = 999736920. Its totient is φ = 444937536.

The previous prime is 667406543. The next prime is 667406557. The reversal of 667406547 is 745604766.

It is a happy number.

667406547 is a `hidden beast` number, since 6 + 67 + 40 + 6 + 547 = 666.

It is not a de Polignac number, because 667406547 - 2² = 667406543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667406543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1373022 + ... + 1373507.

It is an arithmetic number, because the mean of its divisors is an integer number (83311410).

Almost surely, 2^667406547 is an apocalyptic number.

667406547 is a deficient number, since it is larger than the sum of its proper divisors (332330373).

667406547 is an equidigital number, since it uses as much as digits as its factorization.

667406547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746544 (or 2746532 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The square root of 667406547 is about 25834.2127226668. The cubic root of 667406547 is about 873.9035177582.

The spelling of 667406547 in words is "six hundred sixty-seven million, four hundred six thousand, five hundred forty-seven".