667231218415 has 4 divisors (see below), whose sum is σ = 800677462104. Its totient is φ = 533784974728.

The previous prime is 667231218373. The next prime is 667231218439. The reversal of 667231218415 is 514812132766.

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

It is a cyclic number.

It is not a de Polignac number, because 667231218415 - 2²³ = 667222829807 is a prime.

It is a super-2 number, since 2×667231218415² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66723121837 + ... + 66723121846.

It is an arithmetic number, because the mean of its divisors is an integer number (200169365526).

Almost surely, 2^667231218415 is an apocalyptic number.

667231218415 is a deficient number, since it is larger than the sum of its proper divisors (133446243689).

667231218415 is a wasteful number, since it uses less digits than its factorization.

667231218415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133446243688.

The product of its digits is 483840, while the sum is 46.

The spelling of 667231218415 in words is "six hundred sixty-seven billion, two hundred thirty-one million, two hundred eighteen thousand, four hundred fifteen".