667286872643 has 4 divisors (see below), whose sum is σ = 706539041640. Its totient is φ = 628034703648.

The previous prime is 667286872621. The next prime is 667286872649. The reversal of 667286872643 is 346278682766.

667286872643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667286872643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667286872643.

It is not an unprimeable number, because it can be changed into a prime (667286872649) 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, 19626084473 + ... + 19626084506.

It is an arithmetic number, because the mean of its divisors is an integer number (176634760410).

Almost surely, 2^667286872643 is an apocalyptic number.

667286872643 is a deficient number, since it is larger than the sum of its proper divisors (39252168997).

667286872643 is a wasteful number, since it uses less digits than its factorization.

667286872643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39252168996.

The product of its digits is 195084288, while the sum is 65.

The spelling of 667286872643 in words is "six hundred sixty-seven billion, two hundred eighty-six million, eight hundred seventy-two thousand, six hundred forty-three".