667809874249 has 16 divisors (see below), whose sum is σ = 765755206272. Its totient is φ = 570501030528.

The previous prime is 667809874231. The next prime is 667809874393. The reversal of 667809874249 is 942478908766.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 667809874249 - 2¹⁷ = 667809743177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667809874049) 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 15 ways as a sum of consecutive naturals, for example, 20410347 + ... + 20443039.

It is an arithmetic number, because the mean of its divisors is an integer number (47859700392).

Almost surely, 2^667809874249 is an apocalyptic number.

It is an amenable number.

667809874249 is a deficient number, since it is larger than the sum of its proper divisors (97945332023).

667809874249 is a wasteful number, since it uses less digits than its factorization.

667809874249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42336.

The product of its (nonzero) digits is 292626432, while the sum is 70.

The spelling of 667809874249 in words is "six hundred sixty-seven billion, eight hundred nine million, eight hundred seventy-four thousand, two hundred forty-nine".