667231218427 has 4 divisors (see below), whose sum is σ = 672031443160. Its totient is φ = 662430993696.

The previous prime is 667231218373. The next prime is 667231218439. The reversal of 667231218427 is 724812132766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724812132766 = 2 ⋅362406066383.

It is a cyclic number.

It is not a de Polignac number, because 667231218427 - 2³¹ = 665083734779 is a prime.

It is a super-4 number, since 4×667231218427⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667231218727) 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, 2400112158 + ... + 2400112435.

It is an arithmetic number, because the mean of its divisors is an integer number (168007860790).

Almost surely, 2^667231218427 is an apocalyptic number.

667231218427 is a deficient number, since it is larger than the sum of its proper divisors (4800224733).

667231218427 is a wasteful number, since it uses less digits than its factorization.

667231218427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800224732.

The product of its digits is 1354752, while the sum is 49.

The spelling of 667231218427 in words is "six hundred sixty-seven billion, two hundred thirty-one million, two hundred eighteen thousand, four hundred twenty-seven".