667653384617 has 4 divisors (see below), whose sum is σ = 667912267920. Its totient is φ = 667394501316.

The previous prime is 667653384589. The next prime is 667653384649. The reversal of 667653384617 is 716483356766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 667653384617 - 2⁸ = 667653384361 is a prime.

It is a super-2 number, since 2×667653384617² (a number of 24 digits) contains 22 as substring.

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 667653384617.

It is not an unprimeable number, because it can be changed into a prime (667653384677) 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, 129437783 + ... + 129442940.

It is an arithmetic number, because the mean of its divisors is an integer number (166978066980).

Almost surely, 2^667653384617 is an apocalyptic number.

It is an amenable number.

667653384617 is a deficient number, since it is larger than the sum of its proper divisors (258883303).

667653384617 is a wasteful number, since it uses less digits than its factorization.

667653384617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258883302.

The product of its digits is 91445760, while the sum is 62.

The spelling of 667653384617 in words is "six hundred sixty-seven billion, six hundred fifty-three million, three hundred eighty-four thousand, six hundred seventeen".