667589849 has 4 divisors (see below), whose sum is σ = 667843764. Its totient is φ = 667335936.

The previous prime is 667589843. The next prime is 667589861. The reversal of 667589849 is 948985766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948985766 = 2 ⋅474492883.

It can be written as a sum of positive squares in 2 ways, for example, as 590149849 + 77440000 = 24293^2 + 8800^2 .

It is a cyclic number.

It is not a de Polignac number, because 667589849 - 2¹⁶ = 667524313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667589791 and 667589800.

It is not an unprimeable number, because it can be changed into a prime (667589843) 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 3 ways as a sum of consecutive naturals, for example, 122972 + ... + 128285.

It is an arithmetic number, because the mean of its divisors is an integer number (166960941).

Almost surely, 2^667589849 is an apocalyptic number.

It is an amenable number.

667589849 is a deficient number, since it is larger than the sum of its proper divisors (253915).

667589849 is a wasteful number, since it uses less digits than its factorization.

667589849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253914.

The product of its digits is 26127360, while the sum is 62.

The square root of 667589849 is about 25837.7601389904. The cubic root of 667589849 is about 873.9835157746.

The spelling of 667589849 in words is "six hundred sixty-seven million, five hundred eighty-nine thousand, eight hundred forty-nine".