667441408538 has 4 divisors (see below), whose sum is σ = 1001162112810. Its totient is φ = 333720704268.

The previous prime is 667441408471. The next prime is 667441408607. The reversal of 667441408538 is 835804144766.

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., 573317009329 + 94124399209 = 757177^2 + 306797^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166860352133 + ... + 166860352136.

Almost surely, 2^667441408538 is an apocalyptic number.

667441408538 is a deficient number, since it is larger than the sum of its proper divisors (333720704272).

667441408538 is a wasteful number, since it uses less digits than its factorization.

667441408538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333720704271.

The product of its (nonzero) digits is 15482880, while the sum is 56.

The spelling of 667441408538 in words is "six hundred sixty-seven billion, four hundred forty-one million, four hundred eight thousand, five hundred thirty-eight".