667244441858 has 4 divisors (see below), whose sum is σ = 1000866662790. Its totient is φ = 333622220928.

The previous prime is 667244441849. The next prime is 667244441879. The reversal of 667244441858 is 858144442766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 570618584449 + 96625857409 = 755393^2 + 310847^2 .

It is a junction number, because it is equal to n+sod(n) for n = 667244441797 and 667244441806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166811110463 + ... + 166811110466.

Almost surely, 2^667244441858 is an apocalyptic number.

667244441858 is a deficient number, since it is larger than the sum of its proper divisors (333622220932).

667244441858 is a wasteful number, since it uses less digits than its factorization.

667244441858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333622220931.

The product of its digits is 41287680, while the sum is 59.

The spelling of 667244441858 in words is "six hundred sixty-seven billion, two hundred forty-four million, four hundred forty-one thousand, eight hundred fifty-eight".