667441408537 has 4 divisors (see below), whose sum is σ = 667444486500. Its totient is φ = 667438330576.

The previous prime is 667441408471. The next prime is 667441408607. The reversal of 667441408537 is 735804144766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 381712673241 + 285728735296 = 617829^2 + 534536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667441408537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667441408237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186858 + ... + 1656355.

It is an arithmetic number, because the mean of its divisors is an integer number (166861121625).

Almost surely, 2^667441408537 is an apocalyptic number.

It is an amenable number.

667441408537 is a deficient number, since it is larger than the sum of its proper divisors (3077963).

667441408537 is a wasteful number, since it uses less digits than its factorization.

667441408537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077962.

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 667441408537 in words is "six hundred sixty-seven billion, four hundred forty-one million, four hundred eight thousand, five hundred thirty-seven".