667409606 has 4 divisors (see below), whose sum is σ = 1001114412. Its totient is φ = 333704802.

The previous prime is 667409573. The next prime is 667409609. The reversal of 667409606 is 606904766.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667409609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166852400 + ... + 166852403.

It is an arithmetic number, because the mean of its divisors is an integer number (250278603).

Almost surely, 2^667409606 is an apocalyptic number.

667409606 is a deficient number, since it is larger than the sum of its proper divisors (333704806).

667409606 is a wasteful number, since it uses less digits than its factorization.

667409606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333704805.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 667409606 is about 25834.2719270352. The cubic root of 667409606 is about 873.9048529098.

The spelling of 667409606 in words is "six hundred sixty-seven million, four hundred nine thousand, six hundred six".