667605427 has 8 divisors (see below), whose sum is σ = 671617760. Its totient is φ = 663603840.

The previous prime is 667605409. The next prime is 667605431. The reversal of 667605427 is 724506766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667605427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667605227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145474 + ... + 149992.

It is an arithmetic number, because the mean of its divisors is an integer number (83952220).

Almost surely, 2^667605427 is an apocalyptic number.

667605427 is a deficient number, since it is larger than the sum of its proper divisors (4012333).

667605427 is a wasteful number, since it uses less digits than its factorization.

667605427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373.

The product of its (nonzero) digits is 423360, while the sum is 43.

The square root of 667605427 is about 25838.0615952513. The cubic root of 667605427 is about 873.9903137656.

The spelling of 667605427 in words is "six hundred sixty-seven million, six hundred five thousand, four hundred twenty-seven".