667123667 has 8 divisors (see below), whose sum is σ = 776812896. Its totient is φ = 561030912.

The previous prime is 667123651. The next prime is 667123693. The reversal of 667123667 is 766321766.

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

It is a cyclic number.

It is not a de Polignac number, because 667123667 - 2⁴ = 667123651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667123697) 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, 898718 + ... + 899459.

It is an arithmetic number, because the mean of its divisors is an integer number (97101612).

Almost surely, 2^667123667 is an apocalyptic number.

667123667 is a deficient number, since it is larger than the sum of its proper divisors (109689229).

667123667 is a wasteful number, since it uses less digits than its factorization.

667123667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798237.

The product of its digits is 381024, while the sum is 44.

The square root of 667123667 is about 25828.7372320057. The cubic root of 667123667 is about 873.7800324238.

The spelling of 667123667 in words is "six hundred sixty-seven million, one hundred twenty-three thousand, six hundred sixty-seven".