667512722 has 6 divisors (see below), whose sum is σ = 1001323893. Its totient is φ = 333738092.

The previous prime is 667512707. The next prime is 667512733. The reversal of 667512722 is 227215766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 632572801 + 34939921 = 25151^2 + 5911^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18269.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 27404 + ... + 45672.

Almost surely, 2^667512722 is an apocalyptic number.

667512722 is a deficient number, since it is larger than the sum of its proper divisors (333811171).

667512722 is an frugal number, since it uses more digits than its factorization.

667512722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36540 (or 18271 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 667512722 is about 25836.2675709941. The cubic root of 667512722 is about 873.9498572227.

The spelling of 667512722 in words is "six hundred sixty-seven million, five hundred twelve thousand, seven hundred twenty-two".