667434427 has 12 divisors (see below), whose sum is σ = 735378280. Its totient is φ = 605309760.

The previous prime is 667434349. The next prime is 667434437. The reversal of 667434427 is 724434766.

It is not a de Polignac number, because 667434427 - 2²⁷ = 533216699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667434437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46024 + ... + 58762.

Almost surely, 2^667434427 is an apocalyptic number.

667434427 is a deficient number, since it is larger than the sum of its proper divisors (67943853).

667434427 is a wasteful number, since it uses less digits than its factorization.

667434427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13194 (or 13183 counting only the distinct ones).

The product of its digits is 677376, while the sum is 43.

The square root of 667434427 is about 25834.7523115667. The cubic root of 667434427 is about 873.9156862987.

The spelling of 667434427 in words is "six hundred sixty-seven million, four hundred thirty-four thousand, four hundred twenty-seven".