667426243705544 has 16 divisors (see below), whose sum is σ = 1258657872886620. Its totient is φ = 331784144269120.

The previous prime is 667426243705537. The next prime is 667426243705567. The reversal of 667426243705544 is 445507342624766.

It can be written as a sum of positive squares in 2 ways, for example, as 552191815532644 + 115234428172900 = 23498762^2 + 10734730^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241122196487 + ... + 241122199254.

Almost surely, 2^{667426243705544} is an apocalyptic number.

It is an amenable number.

667426243705544 is a deficient number, since it is larger than the sum of its proper divisors (591231629181076).

667426243705544 is a wasteful number, since it uses less digits than its factorization.

667426243705544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482244395920 (or 482244395916 counting only the distinct ones).

The product of its (nonzero) digits is 812851200, while the sum is 65.

The spelling of 667426243705544 in words is "six hundred sixty-seven trillion, four hundred twenty-six billion, two hundred forty-three million, seven hundred five thousand, five hundred forty-four".